Merge mozilla-central to mozilla-inbound

browser/app/profile/firefox.js

@@ -1041,6 +1041,7 @@ pref("devtools.scratchpad.enabled", true);
 
 // Enable the Style Editor.
 pref("devtools.styleeditor.enabled", true);
+pref("devtools.styleeditor.transitions", true);
 
 // Enable tools for Chrome development.
 pref("devtools.chrome.enabled", false);

browser/base/content/browser-thumbnails.js

@@ -0,0 +1,119 @@
+#ifdef 0
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+#endif
+
+/**
+ * Keeps thumbnails of open web pages up-to-date.
+ */
+let gBrowserThumbnails = {
+  _captureDelayMS: 2000,
+
+  /**
+   * Map of capture() timeouts assigned to their browsers.
+   */
+  _timeouts: null,
+
+  /**
+   * Cache for the PageThumbs module.
+   */
+  _pageThumbs: null,
+
+  /**
+   * List of tab events we want to listen for.
+   */
+  _tabEvents: ["TabClose", "TabSelect"],
+
+  init: function Thumbnails_init() {
+    gBrowser.addTabsProgressListener(this);
+
+    this._tabEvents.forEach(function (aEvent) {
+      gBrowser.tabContainer.addEventListener(aEvent, this, false);
+    }, this);
+
+    this._timeouts = new WeakMap();
+
+    XPCOMUtils.defineLazyModuleGetter(this, "_pageThumbs",
+      "resource:///modules/PageThumbs.jsm", "PageThumbs");
+  },
+
+  uninit: function Thumbnails_uninit() {
+    gBrowser.removeTabsProgressListener(this);
+
+    this._tabEvents.forEach(function (aEvent) {
+      gBrowser.tabContainer.removeEventListener(aEvent, this, false);
+    }, this);
+
+    this._timeouts = null;
+    this._pageThumbs = null;
+  },
+
+  handleEvent: function Thumbnails_handleEvent(aEvent) {
+    switch (aEvent.type) {
+      case "TabSelect":
+        this._delayedCapture(aEvent.target.linkedBrowser);
+        break;
+      case "TabClose": {
+        let browser = aEvent.target.linkedBrowser;
+        if (this._timeouts.has(browser)) {
+          clearTimeout(this._timeouts.get(browser));
+          this._timeouts.delete(browser);
+        }
+        break;
+      }
+    }
+  },
+
+  /**
+   * State change progress listener for all tabs.
+   */
+  onStateChange: function Thumbnails_onStateChange(aBrowser, aWebProgress,
+                                                   aRequest, aStateFlags, aStatus) {
+    if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
+        aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK)
+      this._delayedCapture(aBrowser);
+  },
+
+  _capture: function Thumbnails_capture(aBrowser) {
+    if (this._shouldCapture(aBrowser)) {
+      let canvas = this._pageThumbs.capture(aBrowser.contentWindow);
+      this._pageThumbs.store(aBrowser.currentURI.spec, canvas);
+    }
+  },
+
+  _delayedCapture: function Thumbnails_delayedCapture(aBrowser) {
+    if (this._timeouts.has(aBrowser))
+      clearTimeout(this._timeouts.get(aBrowser));
+
+    let timeout = setTimeout(function () {
+      this._timeouts.delete(aBrowser);
+      this._capture(aBrowser);
+    }.bind(this), this._captureDelayMS);
+
+    this._timeouts.set(aBrowser, timeout);
+  },
+
+  _shouldCapture: function Thumbnails_shouldCapture(aBrowser) {
+    // There's no point in taking screenshot of loading pages.
+    if (aBrowser.docShell.busyFlags != Ci.nsIDocShell.BUSY_FLAGS_NONE)
+      return false;
+
+    // Don't take screenshots of about: pages.
+    if (aBrowser.currentURI.schemeIs("about"))
+      return false;
+
+    let channel = aBrowser.docShell.currentDocumentChannel;
+
+    try {
+      // If the channel is a nsIHttpChannel get its http status code.
+      let httpChannel = channel.QueryInterface(Ci.nsIHttpChannel);
+
+      // Continue only if we have a 2xx status code.
+      return Math.floor(httpChannel.responseStatus / 100) == 2;
+    } catch (e) {
+      // Not a http channel, we just assume a success status code.
+      return true;
+    }
+  }
+};

browser/base/content/browser.js

@@ -196,6 +196,7 @@ let gInitialPages = [
 #include browser-places.js
 #include browser-tabPreviews.js
 #include browser-tabview.js
+#include browser-thumbnails.js
 
 #ifdef MOZ_SERVICES_SYNC
 #include browser-syncui.js
@@ -1699,6 +1700,7 @@ function delayedStartup(isLoadingBlank, mustLoadSidebar) {
   gSyncUI.init();
 #endif
 
+  gBrowserThumbnails.init();
   TabView.init();
 
   setUrlAndSearchBarWidthForConditionalForwardButton();
@@ -1820,6 +1822,7 @@ function BrowserShutdown() {
     gPrefService.removeObserver(allTabs.prefName, allTabs);
     ctrlTab.uninit();
     TabView.uninit();
+    gBrowserThumbnails.uninit();
 
     try {
       FullZoom.destroy();

browser/components/Makefile.in

@@ -71,6 +71,7 @@ PARALLEL_DIRS = \
   shell \
   sidebar \
   tabview \
+  thumbnails \
   migration \
   $(NULL)
 

browser/components/thumbnails/BrowserPageThumbs.manifest

@@ -0,0 +1,2 @@
+component {5a4ae9b5-f475-48ae-9dce-0b4c1d347884} PageThumbsProtocol.js
+contract @mozilla.org/network/protocol;1?name=moz-page-thumb {5a4ae9b5-f475-48ae-9dce-0b4c1d347884}

browser/components/thumbnails/Makefile.in

@@ -0,0 +1,23 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DEPTH		= ../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(DEPTH)/config/autoconf.mk
+
+EXTRA_COMPONENTS = \
+  BrowserPageThumbs.manifest \
+  PageThumbsProtocol.js \
+  $(NULL)
+
+ifdef ENABLE_TESTS
+	DIRS += test
+endif
+
+include $(topsrcdir)/config/rules.mk
+
+XPIDL_FLAGS += -I$(topsrcdir)/browser/components/

browser/components/thumbnails/PageThumbsProtocol.js

@@ -0,0 +1,448 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * PageThumbsProtocol.js
+ *
+ * This file implements the moz-page-thumb:// protocol and the corresponding
+ * channel delivering cached thumbnails.
+ *
+ * URL structure:
+ *
+ * moz-page-thumb://thumbnail?url=http%3A%2F%2Fwww.mozilla.org%2F
+ *
+ * This URL requests an image for 'http://www.mozilla.org/'.
+ */
+
+"use strict";
+
+const Cu = Components.utils;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Ci = Components.interfaces;
+
+Cu.import("resource:///modules/PageThumbs.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
+  "resource://gre/modules/NetUtil.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+  "resource://gre/modules/Services.jsm");
+
+/**
+ * Implements the thumbnail protocol handler responsible for moz-page-thumb: URIs.
+ */
+function Protocol() {
+}
+
+Protocol.prototype = {
+  /**
+   * The scheme used by this protocol.
+   */
+  get scheme() PageThumbs.scheme,
+
+  /**
+   * The default port for this protocol (we don't support ports).
+   */
+  get defaultPort() -1,
+
+  /**
+   * The flags specific to this protocol implementation.
+   */
+  get protocolFlags() {
+    return Ci.nsIProtocolHandler.URI_IS_UI_RESOURCE |
+           Ci.nsIProtocolHandler.URI_NORELATIVE |
+           Ci.nsIProtocolHandler.URI_NOAUTH;
+  },
+
+  /**
+   * Creates a new URI object that is suitable for loading by this protocol.
+   * @param aSpec The URI string in UTF8 encoding.
+   * @param aOriginCharset The charset of the document from which the URI originated.
+   * @return The newly created URI.
+   */
+  newURI: function Proto_newURI(aSpec, aOriginCharset) {
+    let uri = Cc["@mozilla.org/network/simple-uri;1"].createInstance(Ci.nsIURI);
+    uri.spec = aSpec;
+    return uri;
+  },
+
+  /**
+   * Constructs a new channel from the given URI for this protocol handler.
+   * @param aURI The URI for which to construct a channel.
+   * @return The newly created channel.
+   */
+  newChannel: function Proto_newChannel(aURI) {
+    return new Channel(aURI);
+  },
+
+  /**
+   * Decides whether to allow a blacklisted port.
+   * @return Always false, we'll never allow ports.
+   */
+  allowPort: function () false,
+
+  classID: Components.ID("{5a4ae9b5-f475-48ae-9dce-0b4c1d347884}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIProtocolHandler])
+};
+
+let NSGetFactory = XPCOMUtils.generateNSGetFactory([Protocol]);
+
+/**
+ * A channel implementation responsible for delivering cached thumbnails.
+ */
+function Channel(aURI) {
+  this._uri = aURI;
+
+  // nsIChannel
+  this.originalURI = aURI;
+
+  // nsIHttpChannel
+  this._responseHeaders = {"content-type": PageThumbs.contentType};
+}
+
+Channel.prototype = {
+  /**
+   * Tracks if the channel has been opened, yet.
+   */
+  _wasOpened: false,
+
+  /**
+   * Opens this channel asynchronously.
+   * @param aListener The listener that receives the channel data when available.
+   * @param aContext A custom context passed to the listener's methods.
+   */
+  asyncOpen: function Channel_asyncOpen(aListener, aContext) {
+    if (this._wasOpened)
+      throw Cr.NS_ERROR_ALREADY_OPENED;
+
+    if (this.canceled)
+      return;
+
+    this._listener = aListener;
+    this._context = aContext;
+
+    this._isPending = true;
+    this._wasOpened = true;
+
+    // Try to read the data from the thumbnail cache.
+    this._readCache(function (aData) {
+      // Update response if there's no data.
+      if (!aData) {
+        this._responseStatus = 404;
+        this._responseText = "Not Found";
+      }
+
+      this._startRequest();
+
+      if (!this.canceled) {
+        this._addToLoadGroup();
+
+        if (aData)
+          this._serveData(aData);
+
+        if (!this.canceled)
+          this._stopRequest();
+      }
+    }.bind(this));
+  },
+
+  /**
+   * Reads a data stream from the cache entry.
+   * @param aCallback The callback the data is passed to.
+   */
+  _readCache: function Channel_readCache(aCallback) {
+    let {url} = parseURI(this._uri);
+
+    // Return early if there's no valid URL given.
+    if (!url) {
+      aCallback(null);
+      return;
+    }
+
+    // Try to get a cache entry.
+    PageThumbsCache.getReadEntry(url, function (aEntry) {
+      let inputStream = aEntry && aEntry.openInputStream(0);
+
+      function closeEntryAndFinish(aData) {
+        if (aEntry) {
+          aEntry.close();
+        }
+        aCallback(aData);
+      }
+
+      // Check if we have a valid entry and if it has any data.
+      if (!inputStream || !inputStream.available()) {
+        closeEntryAndFinish();
+        return;
+      }
+
+      try {
+        // Read the cache entry's data.
+        NetUtil.asyncFetch(inputStream, function (aData, aStatus) {
+          // We might have been canceled while waiting.
+          if (this.canceled)
+            return;
+
+          // Check if we have a valid data stream.
+          if (!Components.isSuccessCode(aStatus) || !aData.available())
+            aData = null;
+
+          closeEntryAndFinish(aData);
+        }.bind(this));
+      } catch (e) {
+        closeEntryAndFinish();
+      }
+    }.bind(this));
+  },
+
+  /**
+   * Calls onStartRequest on the channel listener.
+   */
+  _startRequest: function Channel_startRequest() {
+    try {
+      this._listener.onStartRequest(this, this._context);
+    } catch (e) {
+      // The listener might throw if the request has been canceled.
+      this.cancel(Cr.NS_BINDING_ABORTED);
+    }
+  },
+
+  /**
+   * Calls onDataAvailable on the channel listener and passes the data stream.
+   * @param aData The data to be delivered.
+   */
+  _serveData: function Channel_serveData(aData) {
+    try {
+      let available = aData.available();
+      this._listener.onDataAvailable(this, this._context, aData, 0, available);
+    } catch (e) {
+      // The listener might throw if the request has been canceled.
+      this.cancel(Cr.NS_BINDING_ABORTED);
+    }
+  },
+
+  /**
+   * Calls onStopRequest on the channel listener.
+   */
+  _stopRequest: function Channel_stopRequest() {
+    try {
+      this._listener.onStopRequest(this, this._context, this.status);
+    } catch (e) {
+      // This might throw but is generally ignored.
+    }
+
+    // The request has finished, clean up after ourselves.
+    this._cleanup();
+  },
+
+  /**
+   * Adds this request to the load group, if any.
+   */
+  _addToLoadGroup: function Channel_addToLoadGroup() {
+    if (this.loadGroup)
+      this.loadGroup.addRequest(this, this._context);
+  },
+
+  /**
+   * Removes this request from its load group, if any.
+   */
+  _removeFromLoadGroup: function Channel_removeFromLoadGroup() {
+    if (!this.loadGroup)
+      return;
+
+    try {
+      this.loadGroup.removeRequest(this, this._context, this.status);
+    } catch (e) {
+      // This might throw but is ignored.
+    }
+  },
+
+  /**
+   * Cleans up the channel when the request has finished.
+   */
+  _cleanup: function Channel_cleanup() {
+    this._removeFromLoadGroup();
+    this.loadGroup = null;
+
+    this._isPending = false;
+
+    delete this._listener;
+    delete this._context;
+  },
+
+  /* :::::::: nsIChannel ::::::::::::::: */
+
+  contentType: PageThumbs.contentType,
+  contentLength: -1,
+  owner: null,
+  contentCharset: null,
+  notificationCallbacks: null,
+
+  get URI() this._uri,
+  get securityInfo() null,
+
+  /**
+   * Opens this channel synchronously. Not supported.
+   */
+  open: function Channel_open() {
+    // Synchronous data delivery is not implemented.
+    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+  },
+
+  /* :::::::: nsIHttpChannel ::::::::::::::: */
+
+  redirectionLimit: 10,
+  requestMethod: "GET",
+  allowPipelining: true,
+  referrer: null,
+
+  get requestSucceeded() true,
+
+  _responseStatus: 200,
+  get responseStatus() this._responseStatus,
+
+  _responseText: "OK",
+  get responseStatusText() this._responseText,
+
+  /**
+   * Checks if the server sent the equivalent of a "Cache-control: no-cache"
+   * response header.
+   * @return Always false.
+   */
+  isNoCacheResponse: function () false,
+
+  /**
+   * Checks if the server sent the equivalent of a "Cache-control: no-cache"
+   * response header.
+   * @return Always false.
+   */
+  isNoStoreResponse: function () false,
+
+  /**
+   * Returns the value of a particular request header. Not implemented.
+   */
+  getRequestHeader: function Channel_getRequestHeader() {
+    throw Cr.NS_ERROR_NOT_AVAILABLE;
+  },
+
+  /**
+   * This method is called to set the value of a particular request header.
+   * Not implemented.
+   */
+  setRequestHeader: function Channel_setRequestHeader() {
+    if (this._wasOpened)
+      throw Cr.NS_ERROR_IN_PROGRESS;
+  },
+
+  /**
+   * Call this method to visit all request headers. Not implemented.
+   */
+  visitRequestHeaders: function () {},
+
+  /**
+   * Gets the value of a particular response header.
+   * @param aHeader The case-insensitive name of the response header to query.
+   * @return The header value.
+   */
+  getResponseHeader: function Channel_getResponseHeader(aHeader) {
+    let name = aHeader.toLowerCase();
+    if (name in this._responseHeaders)
+      return this._responseHeaders[name];
+
+    throw Cr.NS_ERROR_NOT_AVAILABLE;
+  },
+
+  /**
+   * This method is called to set the value of a particular response header.
+   * @param aHeader The case-insensitive name of the response header to query.
+   * @param aValue The response header value to set.
+   */
+  setResponseHeader: function Channel_setResponseHeader(aHeader, aValue, aMerge) {
+    let name = aHeader.toLowerCase();
+    if (!aValue && !aMerge)
+      delete this._responseHeaders[name];
+    else
+      this._responseHeaders[name] = aValue;
+  },
+
+  /**
+   * Call this method to visit all response headers.
+   * @param aVisitor The header visitor.
+   */
+  visitResponseHeaders: function Channel_visitResponseHeaders(aVisitor) {
+    for (let name in this._responseHeaders) {
+      let value = this._responseHeaders[name];
+
+      try {
+        aVisitor.visitHeader(name, value);
+      } catch (e) {
+        // The visitor can throw to stop the iteration.
+        return;
+      }
+    }
+  },
+
+  /* :::::::: nsIRequest ::::::::::::::: */
+
+  loadFlags: Ci.nsIRequest.LOAD_NORMAL,
+  loadGroup: null,
+
+  get name() this._uri.spec,
+
+  _status: Cr.NS_OK,
+  get status() this._status,
+
+  _isPending: false,
+  isPending: function () this._isPending,
+
+  resume: function () {},
+  suspend: function () {},
+
+  /**
+   * Cancels this request.
+   * @param aStatus The reason for cancelling.
+   */
+  cancel: function Channel_cancel(aStatus) {
+    if (this.canceled)
+      return;
+
+    this._isCanceled = true;
+    this._status = aStatus;
+
+    this._cleanup();
+  },
+
+  /* :::::::: nsIHttpChannelInternal ::::::::::::::: */
+
+  documentURI: null,
+
+  _isCanceled: false,
+  get canceled() this._isCanceled,
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIChannel,
+                                         Ci.nsIHttpChannel,
+                                         Ci.nsIHttpChannelInternal,
+                                         Ci.nsIRequest])
+};
+
+/**
+ * Parses a given URI and extracts all parameters relevant to this protocol.
+ * @param aURI The URI to parse.
+ * @return The parsed parameters.
+ */
+function parseURI(aURI) {
+  let {scheme, staticHost} = PageThumbs;
+  let re = new RegExp("^" + scheme + "://" + staticHost + ".*?\\?");
+  let query = aURI.spec.replace(re, "");
+  let params = {};
+
+  query.split("&").forEach(function (aParam) {
+    let [key, value] = aParam.split("=").map(decodeURIComponent);
+    params[key.toLowerCase()] = value;
+  });
+
+  return params;
+}

browser/components/thumbnails/test/Makefile.in

@@ -0,0 +1,21 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DEPTH		= ../../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+relativesrcdir  = browser/components/thumbnails/test
+
+include $(DEPTH)/config/autoconf.mk
+include $(topsrcdir)/config/rules.mk
+
+_BROWSER_FILES = \
+	browser_thumbnails_cache.js \
+	browser_thumbnails_capture.js \
+	head.js \
+	$(NULL)
+
+libs::	$(_BROWSER_FILES)
+	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/browser/$(relativesrcdir)

browser/components/thumbnails/test/browser_thumbnails_cache.js

@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests ensure that saving a thumbnail to the cache works. They also
+ * retrieve the thumbnail and display it using an <img> element to compare
+ * its pixel colors.
+ */
+function runTests() {
+  // Create a new tab with a red background.
+  yield addTab("data:text/html,<body bgcolor=ff0000></body>");
+  let cw = gBrowser.selectedTab.linkedBrowser.contentWindow;
+
+  // Capture a thumbnail for the tab.
+  let canvas = PageThumbs.capture(cw);
+
+  // Store the tab into the thumbnail cache.
+  yield PageThumbs.store("key", canvas, next);
+
+  let {width, height} = canvas;
+  let thumb = PageThumbs.getThumbnailURL("key", width, height);
+
+  // Create a new tab with an image displaying the previously stored thumbnail.
+  yield addTab("data:text/html,<img src='" + thumb + "'/>" + 
+               "<canvas width=" + width + " height=" + height + "/>");
+
+  cw = gBrowser.selectedTab.linkedBrowser.contentWindow;
+  let [img, canvas] = cw.document.querySelectorAll("img, canvas");
+
+  // Draw the image to a canvas and compare the pixel color values.
+  let ctx = canvas.getContext("2d");
+  ctx.drawImage(img, 0, 0, width, height);
+  checkCanvasColor(ctx, 255, 0, 0, "we have a red image and canvas");
+}

browser/components/thumbnails/test/browser_thumbnails_capture.js

@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests ensure that capturing a site's screenshot to a canvas actually
+ * works.
+ */
+function runTests() {
+  // Create a tab with a red background.
+  yield addTab("data:text/html,<body bgcolor=ff0000></body>");
+  checkCurrentThumbnailColor(255, 0, 0, "we have a red thumbnail");
+
+  // Load a page with a green background.
+  yield navigateTo("data:text/html,<body bgcolor=00ff00></body>");
+  checkCurrentThumbnailColor(0, 255, 0, "we have a green thumbnail");
+
+  // Load a page with a blue background.
+  yield navigateTo("data:text/html,<body bgcolor=0000ff></body>");
+  checkCurrentThumbnailColor(0, 0, 255, "we have a blue thumbnail");
+}
+
+/**
+ * Captures a thumbnail of the currently selected tab and checks the color of
+ * the resulting canvas.
+ * @param aRed The red component's intensity.
+ * @param aGreen The green component's intensity.
+ * @param aBlue The blue component's intensity.
+ * @param aMessage The info message to print when checking the pixel color.
+ */
+function checkCurrentThumbnailColor(aRed, aGreen, aBlue, aMessage) {
+  let tab = gBrowser.selectedTab;
+  let cw = tab.linkedBrowser.contentWindow;
+
+  let canvas = PageThumbs.capture(cw);
+  let ctx = canvas.getContext("2d");
+
+  checkCanvasColor(ctx, aRed, aGreen, aBlue, aMessage);
+}

browser/components/thumbnails/test/head.js

@@ -0,0 +1,93 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource:///modules/PageThumbs.jsm");
+
+registerCleanupFunction(function () {
+  while (gBrowser.tabs.length > 1)
+    gBrowser.removeTab(gBrowser.tabs[1]);
+});
+
+/**
+ * Provide the default test function to start our test runner.
+ */
+function test() {
+  TestRunner.run();
+}
+
+/**
+ * The test runner that controls the execution flow of our tests.
+ */
+let TestRunner = {
+  /**
+   * Starts the test runner.
+   */
+  run: function () {
+    waitForExplicitFinish();
+
+    this._iter = runTests();
+    this.next();
+  },
+
+  /**
+   * Runs the next available test or finishes if there's no test left.
+   */
+  next: function () {
+    try {
+      TestRunner._iter.next();
+    } catch (e if e instanceof StopIteration) {
+      finish();
+    }
+  }
+};
+
+/**
+ * Continues the current test execution.
+ */
+function next() {
+  TestRunner.next();
+}
+
+/**
+ * Creates a new tab with the given URI.
+ * @param aURI The URI that's loaded in the tab.
+ */
+function addTab(aURI) {
+  let tab = gBrowser.selectedTab = gBrowser.addTab(aURI);
+  whenBrowserLoaded(tab.linkedBrowser);
+}
+
+/**
+ * Loads a new URI into the currently selected tab.
+ * @param aURI The URI to load.
+ */
+function navigateTo(aURI) {
+  let browser = gBrowser.selectedTab.linkedBrowser;
+  whenBrowserLoaded(browser);
+  browser.loadURI(aURI);
+}
+
+/**
+ * Continues the current test execution when a load event for the given browser
+ * has been received
+ * @param aBrowser The browser to listen on.
+ */
+function whenBrowserLoaded(aBrowser) {
+  aBrowser.addEventListener("load", function onLoad() {
+    aBrowser.removeEventListener("load", onLoad, true);
+    executeSoon(next);
+  }, true);
+}
+
+/**
+ * Checks the top-left pixel of a given canvas' 2d context for a given color.
+ * @param aContext The 2D context of a canvas.
+ * @param aRed The red component's intensity.
+ * @param aGreen The green component's intensity.
+ * @param aBlue The blue component's intensity.
+ * @param aMessage The info message to print when comparing the pixel color.
+ */
+function checkCanvasColor(aContext, aRed, aGreen, aBlue, aMessage) {
+  let [r, g, b] = aContext.getImageData(0, 0, 1, 1).data;
+  ok(r == aRed && g == aGreen && b == aBlue, aMessage);
+}

browser/devtools/styleeditor/StyleEditor.jsm

@@ -59,6 +59,23 @@ const UPDATE_STYLESHEET_THROTTLE_DELAY = 500;
 // @see StyleEditor._persistExpando
 const STYLESHEET_EXPANDO = "-moz-styleeditor-stylesheet-";
 
+const TRANSITIONS_PREF = "devtools.styleeditor.transitions";
+
+const TRANSITION_CLASS = "moz-styleeditor-transitioning";
+const TRANSITION_DURATION_MS = 500;
+const TRANSITION_RULE = "\
+:root.moz-styleeditor-transitioning, :root.moz-styleeditor-transitioning * {\
+-moz-transition-duration: " + TRANSITION_DURATION_MS + "ms !important; \
+-moz-transition-delay: 0ms !important;\
+-moz-transition-timing-function: ease-out !important;\
+-moz-transition-property: all !important;\
+}";
+
+/**
+ * Style Editor module-global preferences
+ */
+const TRANSITIONS_ENABLED = Services.prefs.getBoolPref(TRANSITIONS_PREF);
+
 
 /**
  * StyleEditor constructor.
@@ -107,6 +124,9 @@ function StyleEditor(aDocument, aStyleSheet)
 
   // this is to perform pending updates before editor closing
   this._onWindowUnloadBinding = this._onWindowUnload.bind(this);
+
+  this._transitionRefCount = 0;
+
   this._focusOnSourceEditorReady = false;
 }
 
@@ -405,8 +425,13 @@ StyleEditor.prototype = {
    *                           Arguments: (StyleEditor editor)
    *                           @see inputElement
    *
-   *   onCommit:               Called when changes have been committed/applied
-   *                           to the live DOM style sheet.
+   *   onUpdate:               Called when changes are being applied to the live
+   *                           DOM style sheet but might not be complete from
+   *                           a WYSIWYG perspective (eg. transitioned update).
+   *                           Arguments: (StyleEditor editor)
+   *
+   *   onCommit:               Called when changes have been completely committed
+   *                           /applied to the live DOM style sheet.
    *                           Arguments: (StyleEditor editor)
    * }
    *
@@ -640,15 +665,50 @@ StyleEditor.prototype = {
     let source = this._state.text;
     let oldNode = this.styleSheet.ownerNode;
     let oldIndex = this.styleSheetIndex;
-
-    let newNode = this.contentDocument.createElement("style");
+    let content = this.contentDocument;
+    let newNode = content.createElement("style");
     newNode.setAttribute("type", "text/css");
-    newNode.appendChild(this.contentDocument.createTextNode(source));
+    newNode.appendChild(content.createTextNode(source));
     oldNode.parentNode.replaceChild(newNode, oldNode);
 
-    this._styleSheet = this.contentDocument.styleSheets[oldIndex];
+    this._styleSheet = content.styleSheets[oldIndex];
     this._persistExpando();
 
+    if (!TRANSITIONS_ENABLED) {
+      this._triggerAction("Update");
+      this._triggerAction("Commit");
+      return;
+    }
+
+    // Insert the global transition rule
+    // Use a ref count to make sure we do not add it multiple times.. and remove
+    // it only when all pending StyleEditor-generated transitions ended.
+    if (!this._transitionRefCount) {
+      this._styleSheet.insertRule(TRANSITION_RULE, 0);
+      content.documentElement.classList.add(TRANSITION_CLASS);
+    }
+
+    this._transitionRefCount++;
+
+    // Set up clean up and commit after transition duration (+10% buffer)
+    // @see _onTransitionEnd
+    content.defaultView.setTimeout(this._onTransitionEnd.bind(this),
+                                   Math.floor(TRANSITION_DURATION_MS * 1.1));
+
+    this._triggerAction("Update");
+  },
+
+  /**
+    * This cleans up class and rule added for transition effect and then trigger
+    * Commit as the changes have been completed.
+    */
+  _onTransitionEnd: function SE__onTransitionEnd()
+  {
+    if (--this._transitionRefCount == 0) {
+      this.contentDocument.documentElement.classList.remove(TRANSITION_CLASS);
+      this.styleSheet.deleteRule(0);
+    }
+
     this._triggerAction("Commit");
   },
 

browser/devtools/styleeditor/StyleEditorChrome.jsm

@@ -156,11 +156,14 @@ StyleEditorChrome.prototype = {
     aContentWindow.addEventListener("unload", onContentUnload, false);
 
     if (aContentWindow.document.readyState == "complete") {
+      this._root.classList.remove("loading");
       this._populateChrome();
       return;
     } else {
+      this._root.classList.add("loading");
       let onContentReady = function () {
         aContentWindow.removeEventListener("load", onContentReady, false);
+        this._root.classList.remove("loading");
         this._populateChrome();
       }.bind(this);
       aContentWindow.addEventListener("load", onContentReady, false);
@@ -299,7 +302,7 @@ StyleEditorChrome.prototype = {
   },
 
   /**
-   * Reset the chrome UI to an empty state.
+   * Reset the chrome UI to an empty and ready state.
    */
   _resetChrome: function SEC__resetChrome()
   {
@@ -309,6 +312,12 @@ StyleEditorChrome.prototype = {
     this._editors = [];
 
     this._view.removeAll();
+
+    // (re)enable UI
+    let matches = this._root.querySelectorAll("toolbarbutton,input,select");
+    for (let i = 0; i < matches.length; ++i) {
+      matches[i].removeAttribute("disabled");
+    }
   },
 
   /**

browser/devtools/styleeditor/splitview.css

@@ -46,6 +46,10 @@ box,
   -moz-box-pack: center;
 }
 
+.loading .splitview-nav-container > .placeholder {
+  display: none !important;
+}
+
 .splitview-controller,
 .splitview-main {
   -moz-box-flex: 0;

browser/devtools/styleeditor/styleeditor.xul

@@ -54,18 +54,20 @@
         persist="screenX screenY width height sizemode">
 <xul:script type="application/javascript" src="chrome://global/content/globalOverlay.js"/>
 
-<xul:box id="style-editor-chrome" class="splitview-root">
+<xul:box id="style-editor-chrome" class="splitview-root loading">
   <xul:box class="splitview-controller" id="stylesheets-controller" persist="width height">
     <xul:box class="splitview-main">
       <xul:toolbar class="devtools-toolbar">
         <xul:toolbarbutton class="style-editor-newButton devtools-toolbarbutton"
                     accesskey="&newButton.accesskey;"
                     tooltiptext="&newButton.tooltip;"
-                    label="&newButton.label;"/>
+                    label="&newButton.label;"
+                    disabled="true"/>
         <xul:toolbarbutton class="style-editor-importButton devtools-toolbarbutton"
                     accesskey="&importButton.accesskey;"
                     tooltiptext="&importButton.tooltip;"
-                    label="&importButton.label;"/>
+                    label="&importButton.label;"
+                    disabled="true"/>
         <xul:spacer flex="1"/>
         <xul:textbox class="splitview-filter devtools-searchinput"
                      type="search" flex="1"

browser/devtools/styleeditor/test/browser_styleeditor_loading.js

@@ -18,6 +18,18 @@ function test()
     isnot(gBrowser.selectedBrowser.contentWindow.document.readyState, "complete",
           "content document is still loading");
 
+    let root = gChromeWindow.document.querySelector(".splitview-root");
+    ok(root.classList.contains("loading"),
+       "style editor root element has 'loading' class name");
+
+    let button = gChromeWindow.document.querySelector(".style-editor-newButton");
+    ok(button.hasAttribute("disabled"),
+       "new style sheet button is disabled");
+
+    button = gChromeWindow.document.querySelector(".style-editor-importButton");
+    ok(button.hasAttribute("disabled"),
+       "import button is disabled");
+
     if (!aChrome.isContentAttached) {
       aChrome.addChromeListener({
         onContentAttach: run
@@ -35,5 +47,17 @@ function run(aChrome)
   is(aChrome.contentWindow.document.readyState, "complete",
      "content document is complete");
 
+  let root = gChromeWindow.document.querySelector(".splitview-root");
+  ok(!root.classList.contains("loading"),
+     "style editor root element does not have 'loading' class name anymore");
+
+  let button = gChromeWindow.document.querySelector(".style-editor-newButton");
+  ok(!button.hasAttribute("disabled"),
+     "new style sheet button is enabled");
+
+  button = gChromeWindow.document.querySelector(".style-editor-importButton");
+  ok(!button.hasAttribute("disabled"),
+     "import button is enabled");
+
   finish();
 }

browser/devtools/styleeditor/test/browser_styleeditor_new.js

@@ -4,6 +4,8 @@
 
 const TESTCASE_URI = TEST_BASE + "simple.html";
 
+const TRANSITION_CLASS = "moz-styleeditor-transitioning";
+
 
 function test()
 {
@@ -30,6 +32,7 @@ function run(aChrome)
 
 let gAddedCount = 0;  // to add new stylesheet after the 2 initial stylesheets
 let gNewEditor;       // to make sure only one new stylesheet got created
+let gUpdateCount = 0; // to make sure only one Update event is triggered
 let gCommitCount = 0; // to make sure only one Commit event is triggered
 
 function testEditorAdded(aChrome, aEditor)
@@ -82,6 +85,13 @@ function testEditorAdded(aChrome, aEditor)
       }, gChromeWindow) ;
     },
 
+    onUpdate: function (aEditor) {
+      gUpdateCount++;
+
+      ok(content.document.documentElement.classList.contains(TRANSITION_CLASS),
+         "StyleEditor's transition class has been added to content");
+    },
+
     onCommit: function (aEditor) {
       gCommitCount++;
 
@@ -99,7 +109,11 @@ function testEditorAdded(aChrome, aEditor)
       is(computedStyle.backgroundColor, "rgb(255, 0, 0)",
          "content's background color has been updated to red");
 
+      ok(!content.document.documentElement.classList.contains(TRANSITION_CLASS),
+         "StyleEditor's transition class has been removed from content");
+
       executeSoon(function () {
+        is(gUpdateCount, 1, "received only one Update event (throttle)");
         is(gCommitCount, 1, "received only one Commit event (throttle)");
 
         aEditor.removeActionListener(listener);

browser/devtools/webconsole/test/browser_warn_user_about_replaced_api.js

@@ -37,7 +37,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_REPLACED_API_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console-replaced-api.html";
+const TEST_REPLACED_API_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console-replaced-api.html";
 
 function test() {
   waitForExplicitFinish();

browser/devtools/webconsole/test/browser_webconsole_basic_net_logging.js

@@ -41,7 +41,7 @@
 // Tests that the page's resources are displayed in the console as they're
 // loaded
 
-const TEST_NETWORK_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-network.html" + "?_date=" + Date.now();
+const TEST_NETWORK_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-network.html" + "?_date=" + Date.now();
 
 function test() {
   addTab("data:text/html,Web Console basic network logging test");

browser/devtools/webconsole/test/browser_webconsole_bug_578437_page_reload.js

@@ -39,7 +39,7 @@
  * ***** END LICENSE BLOCK ***** */
 
 // Tests that the console object still exists after a page reload.
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_580030_errors_after_page_reload.js

@@ -40,7 +40,7 @@
 
 // Tests that errors still show up in the Web Console after a page reload.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-error.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-error.html";
 
 function test() {
   expectUncaughtException();

browser/devtools/webconsole/test/browser_webconsole_bug_580454_timestamp_l10n.js

@@ -12,7 +12,7 @@
 
 Cu.import("resource:///modules/HUDService.jsm");
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_581231_close_button.js

@@ -10,7 +10,7 @@
 
 // Tests that the Web Console close button functions.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_585237_line_limit.js

@@ -12,7 +12,7 @@
 // Tests that the Web Console limits the number of lines displayed according to
 // the user's preferences.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_585956_console_trace.js

@@ -36,7 +36,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-585956-console-trace.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-585956-console-trace.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_588730_text_node_insertion.js

@@ -40,7 +40,7 @@
 
 // Tests that adding text to one of the output labels doesn't cause errors.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_bug_593003_iframe_wrong_hud.js

@@ -36,11 +36,11 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-593003-iframe-wrong-hud.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-593003-iframe-wrong-hud.html";
 
-const TEST_IFRAME_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-593003-iframe-wrong-hud-iframe.html";
+const TEST_IFRAME_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-593003-iframe-wrong-hud-iframe.html";
 
-const TEST_DUMMY_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_DUMMY_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 let tab1, tab2;
 

browser/devtools/webconsole/test/browser_webconsole_bug_597103_deactivateHUDForContext_unfocused_window.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 let tab1, tab2, win1, win2;
 let noErrors = true;

browser/devtools/webconsole/test/browser_webconsole_bug_597460_filter_scroll.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-network.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-network.html";
 
 function tabLoad(aEvent) {
   browser.removeEventListener(aEvent.type, arguments.callee, true);

browser/devtools/webconsole/test/browser_webconsole_bug_597756_reopen_closed_tab.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-597756-reopen-closed-tab.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-597756-reopen-closed-tab.html";
 
 let newTabIsOpen = false;
 

browser/devtools/webconsole/test/browser_webconsole_bug_599725_response_headers.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-599725-response-headers.sjs";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-599725-response-headers.sjs";
 
 let lastFinishedRequest = null;
 

browser/devtools/webconsole/test/browser_webconsole_bug_600183_charset.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-600183-charset.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-600183-charset.html";
 
 let lastFinishedRequest = null;
 

browser/devtools/webconsole/test/browser_webconsole_bug_601177_log_levels.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-601177-log-levels.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-601177-log-levels.html";
 
 let msgs;
 

browser/devtools/webconsole/test/browser_webconsole_bug_603750_websocket.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-603750-websocket.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-603750-websocket.html";
 const pref_ws = "network.websocket.enabled";
 const pref_block = "network.websocket.override-security-block";
 

browser/devtools/webconsole/test/browser_webconsole_bug_613013_console_api_iframe.js

@@ -8,7 +8,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-613013-console-api-iframe.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-613013-console-api-iframe.html";
 
 let TestObserver = {
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),

browser/devtools/webconsole/test/browser_webconsole_bug_630733_response_redirect_headers.js

@@ -7,7 +7,7 @@
  *   Mihai Sucan <mihai.sucan@gmail.com>
  */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-bug-630733-response-redirect-headers.sjs";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-bug-630733-response-redirect-headers.sjs";
 
 let lastFinishedRequests = {};
 

browser/devtools/webconsole/test/browser_webconsole_bug_632817.js

@@ -4,9 +4,9 @@
 
 // Tests that network log messages bring up the network panel.
 
-const TEST_NETWORK_REQUEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-network-request.html";
+const TEST_NETWORK_REQUEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-network-request.html";
 
-const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test//test-image.png";
+const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test/test-image.png";
 
 const TEST_DATA_JSON_CONTENT =
   '{ id: "test JSON data", myArray: [ "foo", "bar", "baz", "biff" ] }';

browser/devtools/webconsole/test/browser_webconsole_console_extras.js

@@ -37,7 +37,7 @@
 
 // Tests that the basic console.log()-style APIs and filtering work.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console-extras.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console-extras.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_live_filtering_of_message_types.js

@@ -40,7 +40,7 @@
 
 // Tests that the message type filter checkboxes work.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_live_filtering_on_search_strings.js

@@ -40,7 +40,7 @@
 
 // Tests that the text filter box works.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_log_node_classes.js

@@ -41,7 +41,7 @@
 // Tests that console logging via the console API produces nodes of the correct
 // CSS classes.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_message_node_id.js

@@ -35,7 +35,7 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_netlogging.js

@@ -12,9 +12,9 @@
 
 // Tests that network log messages bring up the network panel.
 
-const TEST_NETWORK_REQUEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-network-request.html";
+const TEST_NETWORK_REQUEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-network-request.html";
 
-const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test//test-image.png";
+const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test/test-image.png";
 
 const TEST_DATA_JSON_CONTENT =
   '{ id: "test JSON data", myArray: [ "foo", "bar", "baz", "biff" ] }';

browser/devtools/webconsole/test/browser_webconsole_network_panel.js

@@ -41,9 +41,9 @@
 
 // Tests that the network panel works.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
-const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test//test-image.png";
-const TEST_ENCODING_ISO_8859_1 = "http://example.com/browser/browser/devtools/webconsole/test//test-encoding-ISO-8859-1.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
+const TEST_IMG = "http://example.com/browser/browser/devtools/webconsole/test/test-image.png";
+const TEST_ENCODING_ISO_8859_1 = "http://example.com/browser/browser/devtools/webconsole/test/test-encoding-ISO-8859-1.html";
 
 let testDriver;
 

browser/devtools/webconsole/test/browser_webconsole_registries.js

@@ -41,7 +41,7 @@
 // Tests that the HUD service keeps an accurate registry of all the Web Console
 // instances.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-console.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
 
 function test() {
   addTab(TEST_URI);

browser/devtools/webconsole/test/browser_webconsole_view_source.js

@@ -4,7 +4,7 @@
 // Tests that source URLs in the Web Console can be clicked to display the
 // standard View Source window.
 
-const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test//test-error.html";
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-error.html";
 
 function test() {
   expectUncaughtException();

browser/devtools/webconsole/test/test-bug-593003-iframe-wrong-hud.html

@@ -8,6 +8,6 @@
    <body>
      <p>WebConsole test: iframe associated to the wrong HUD.</p>
      <iframe 
-       src="http://example.com/browser/browser/devtools/webconsole/test//test-bug-593003-iframe-wrong-hud-iframe.html"></iframe>
+       src="http://example.com/browser/browser/devtools/webconsole/test/test-bug-593003-iframe-wrong-hud-iframe.html"></iframe>
    </body>
  </html>

browser/devtools/webconsole/test/test-network-request.html

@@ -27,7 +27,7 @@
     <h1>Heads Up Display HTTP Logging Testpage</h1>
     <h2>This page is used to test the HTTP logging.</h2>
 
-    <form action="http://example.com/browser/browser/devtools/webconsole/test//test-network-request.html" method="post">
+    <form action="http://example.com/browser/browser/devtools/webconsole/test/test-network-request.html" method="post">
       <input name="name" type="text" value="foo bar"><br>
       <input name="age" type="text" value="144"><br>
     </form>

browser/installer/package-manifest.in

@@ -283,6 +283,7 @@
 @BINPATH@/components/nsSetDefaultBrowser.manifest
 @BINPATH@/components/nsSetDefaultBrowser.js
 @BINPATH@/components/BrowserPlaces.manifest
+@BINPATH@/components/BrowserPageThumbs.manifest
 @BINPATH@/components/nsPrivateBrowsingService.manifest
 @BINPATH@/components/nsPrivateBrowsingService.js
 @BINPATH@/components/toolkitsearch.manifest
@@ -346,6 +347,7 @@
 @BINPATH@/components/nsPlacesExpiration.js
 @BINPATH@/components/PlacesProtocolHandler.js
 @BINPATH@/components/PlacesCategoriesStarter.js
+@BINPATH@/components/PageThumbsProtocol.js
 @BINPATH@/components/nsDefaultCLH.manifest
 @BINPATH@/components/nsDefaultCLH.js
 @BINPATH@/components/nsContentPrefService.manifest

browser/modules/Makefile.in

@@ -52,6 +52,7 @@ EXTRA_JS_MODULES = \
 	openLocationLastURL.jsm \
 	NetworkPrioritizer.jsm \
 	offlineAppCache.jsm \
+	PageThumbs.jsm \
 	$(NULL)
 
 ifeq ($(MOZ_WIDGET_TOOLKIT),windows) 

browser/modules/PageThumbs.jsm

@@ -0,0 +1,265 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+let EXPORTED_SYMBOLS = ["PageThumbs", "PageThumbsCache"];
+
+const Cu = Components.utils;
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+const HTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
+
+/**
+ * The default width for page thumbnails.
+ *
+ * Hint: This is the default value because the 'New Tab Page' is the only
+ *       client for now.
+ */
+const THUMBNAIL_WIDTH = 201;
+
+/**
+ * The default height for page thumbnails.
+ *
+ * Hint: This is the default value because the 'New Tab Page' is the only
+ *       client for now.
+ */
+const THUMBNAIL_HEIGHT = 127;
+
+/**
+ * The default background color for page thumbnails.
+ */
+const THUMBNAIL_BG_COLOR = "#fff";
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
+  "resource://gre/modules/NetUtil.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+  "resource://gre/modules/Services.jsm");
+
+/**
+ * Singleton providing functionality for capturing web page thumbnails and for
+ * accessing them if already cached.
+ */
+let PageThumbs = {
+  /**
+   * The scheme to use for thumbnail urls.
+   */
+  get scheme() "moz-page-thumb",
+
+  /**
+   * The static host to use for thumbnail urls.
+   */
+  get staticHost() "thumbnail",
+
+  /**
+   * The thumbnails' image type.
+   */
+  get contentType() "image/png",
+
+  /**
+   * Gets the thumbnail image's url for a given web page's url.
+   * @param aUrl The web page's url that is depicted in the thumbnail.
+   * @return The thumbnail image's url.
+   */
+  getThumbnailURL: function PageThumbs_getThumbnailURL(aUrl) {
+    return this.scheme + "://" + this.staticHost +
+           "?url=" + encodeURIComponent(aUrl);
+  },
+
+  /**
+   * Creates a canvas containing a thumbnail depicting the given window.
+   * @param aWindow The DOM window to capture a thumbnail from.
+   * @return The newly created canvas containing the image data.
+   */
+  capture: function PageThumbs_capture(aWindow) {
+    let [sx, sy, sw, sh, scale] = this._determineCropRectangle(aWindow);
+
+    let canvas = this._createCanvas();
+    let ctx = canvas.getContext("2d");
+
+    // Scale the canvas accordingly.
+    ctx.scale(scale, scale);
+
+    try {
+      // Draw the window contents to the canvas.
+      ctx.drawWindow(aWindow, sx, sy, sw, sh, THUMBNAIL_BG_COLOR,
+                     ctx.DRAWWINDOW_DO_NOT_FLUSH);
+    } catch (e) {
+      // We couldn't draw to the canvas for some reason.
+    }
+
+    return canvas;
+  },
+
+  /**
+   * Stores the image data contained in the given canvas to the underlying
+   * storage.
+   * @param aKey The key to use for the storage.
+   * @param aCanvas The canvas containing the thumbnail's image data.
+   * @param aCallback The function to be called when the canvas data has been
+   *                  stored (optional).
+   */
+  store: function PageThumbs_store(aKey, aCanvas, aCallback) {
+    let self = this;
+
+    function finish(aSuccessful) {
+      if (aCallback)
+        aCallback(aSuccessful);
+    }
+
+    // Get a writeable cache entry.
+    PageThumbsCache.getWriteEntry(aKey, function (aEntry) {
+      if (!aEntry) {
+        finish(false);
+        return;
+      }
+
+      // Extract image data from the canvas.
+      self._readImageData(aCanvas, function (aData) {
+        let outputStream = aEntry.openOutputStream(0);
+
+        // Write the image data to the cache entry.
+        NetUtil.asyncCopy(aData, outputStream, function (aResult) {
+          let success = Components.isSuccessCode(aResult);
+          if (success)
+            aEntry.markValid();
+
+          aEntry.close();
+          finish(success);
+        });
+      });
+    });
+  },
+
+  /**
+   * Reads the image data from a given canvas and passes it to the callback.
+   * @param aCanvas The canvas to read the image data from.
+   * @param aCallback The function that the image data is passed to.
+   */
+  _readImageData: function PageThumbs_readImageData(aCanvas, aCallback) {
+    let dataUri = aCanvas.toDataURL(PageThumbs.contentType, "");
+    let uri = Services.io.newURI(dataUri, "UTF8", null);
+
+    NetUtil.asyncFetch(uri, function (aData, aResult) {
+      if (Components.isSuccessCode(aResult) && aData && aData.available())
+        aCallback(aData);
+    });
+  },
+
+  /**
+   * Determines the crop rectangle for a given content window.
+   * @param aWindow The content window.
+   * @return An array containing x, y, width, heigh and the scale of the crop
+   *         rectangle.
+   */
+  _determineCropRectangle: function PageThumbs_determineCropRectangle(aWindow) {
+    let sx = 0;
+    let sy = 0;
+    let sw = aWindow.innerWidth;
+    let sh = aWindow.innerHeight;
+
+    let scale = Math.max(THUMBNAIL_WIDTH / sw, THUMBNAIL_HEIGHT / sh);
+    let scaledWidth = sw * scale;
+    let scaledHeight = sh * scale;
+
+    if (scaledHeight > THUMBNAIL_HEIGHT) {
+      sy = Math.floor(Math.abs((scaledHeight - THUMBNAIL_HEIGHT) / 2) / scale);
+      sh -= 2 * sy;
+    }
+
+    if (scaledWidth > THUMBNAIL_WIDTH) {
+      sx = Math.floor(Math.abs((scaledWidth - THUMBNAIL_WIDTH) / 2) / scale);
+      sw -= 2 * sx;
+    }
+
+    return [sx, sy, sw, sh, scale];
+  },
+
+  /**
+   * Creates a new hidden canvas element.
+   * @return The newly created canvas.
+   */
+  _createCanvas: function PageThumbs_createCanvas() {
+    let doc = Services.appShell.hiddenDOMWindow.document;
+    let canvas = doc.createElementNS(HTML_NAMESPACE, "canvas");
+    canvas.mozOpaque = true;
+    canvas.width = THUMBNAIL_WIDTH;
+    canvas.height = THUMBNAIL_HEIGHT;
+    return canvas;
+  }
+};
+
+/**
+ * A singleton handling the storage of page thumbnails.
+ */
+let PageThumbsCache = {
+  /**
+   * Calls the given callback with a cache entry opened for reading.
+   * @param aKey The key identifying the desired cache entry.
+   * @param aCallback The callback that is called when the cache entry is ready.
+   */
+  getReadEntry: function Cache_getReadEntry(aKey, aCallback) {
+    // Try to open the desired cache entry.
+    this._openCacheEntry(aKey, Ci.nsICache.ACCESS_READ, aCallback);
+  },
+
+  /**
+   * Calls the given callback with a cache entry opened for writing.
+   * @param aKey The key identifying the desired cache entry.
+   * @param aCallback The callback that is called when the cache entry is ready.
+   */
+  getWriteEntry: function Cache_getWriteEntry(aKey, aCallback) {
+    // Try to open the desired cache entry.
+    this._openCacheEntry(aKey, Ci.nsICache.ACCESS_WRITE, aCallback);
+  },
+
+  /**
+   * Opens the cache entry identified by the given key.
+   * @param aKey The key identifying the desired cache entry.
+   * @param aAccess The desired access mode (see nsICache.ACCESS_* constants).
+   * @param aCallback The function to be called when the cache entry was opened.
+   */
+  _openCacheEntry: function Cache_openCacheEntry(aKey, aAccess, aCallback) {
+    function onCacheEntryAvailable(aEntry, aAccessGranted, aStatus) {
+      let validAccess = aAccess == aAccessGranted;
+      let validStatus = Components.isSuccessCode(aStatus);
+
+      // Check if a valid entry was passed and if the
+      // access we requested was actually granted.
+      if (aEntry && !(validAccess && validStatus)) {
+        aEntry.close();
+        aEntry = null;
+      }
+
+      aCallback(aEntry);
+    }
+
+    let listener = this._createCacheListener(onCacheEntryAvailable);
+    this._cacheSession.asyncOpenCacheEntry(aKey, aAccess, listener);
+  },
+
+  /**
+   * Returns a cache listener implementing the nsICacheListener interface.
+   * @param aCallback The callback to be called when the cache entry is available.
+   * @return The new cache listener.
+   */
+  _createCacheListener: function Cache_createCacheListener(aCallback) {
+    return {
+      onCacheEntryAvailable: aCallback,
+      QueryInterface: XPCOMUtils.generateQI([Ci.nsICacheListener])
+    };
+  }
+};
+
+/**
+ * Define a lazy getter for the cache session.
+ */
+XPCOMUtils.defineLazyGetter(PageThumbsCache, "_cacheSession", function () {
+  return Services.cache.createSession(PageThumbs.scheme,
+                                     Ci.nsICache.STORE_ON_DISK, true);
+});

browser/themes/gnomestripe/devtools/splitview.css

@@ -41,6 +41,12 @@
   color: white;
 }
 
+.loading .splitview-nav-container {
+  background-image: url(chrome://global/skin/icons/loading_16.png);
+  background-repeat: no-repeat;
+  background-position: center center;
+}
+
 .splitview-nav {
   -moz-appearance: none;
   margin: 0;
@@ -70,7 +76,6 @@
 
 .placeholder {
   -moz-box-flex: 1;
-  -moz-box-back: center;
   text-align: center;
 }
 

browser/themes/gnomestripe/devtools/styleeditor.css

@@ -36,6 +36,10 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#style-editor-chrome {
+  background-color: hsl(208,11%,27%);
+}
+
 .stylesheet-title,
 .stylesheet-name {
   text-decoration: none;

browser/themes/pinstripe/devtools/splitview.css

@@ -41,6 +41,12 @@
   color: white;
 }
 
+.loading .splitview-nav-container {
+  background-image: url(chrome://global/skin/icons/loading_16.png);
+  background-repeat: no-repeat;
+  background-position: center center;
+}
+
 .splitview-nav {
   -moz-appearance: none;
   margin: 0;
@@ -70,7 +76,6 @@
 
 .placeholder {
   -moz-box-flex: 1;
-  -moz-box-back: center;
   text-align: center;
 }
 

browser/themes/pinstripe/devtools/styleeditor.css

@@ -36,6 +36,10 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#style-editor-chrome {
+  background-color: hsl(208,11%,27%);
+}
+
 .stylesheet-title,
 .stylesheet-name {
   text-decoration: none;

browser/themes/winstripe/devtools/splitview.css

@@ -41,6 +41,12 @@
   color: white;
 }
 
+.loading .splitview-nav-container {
+  background-image: url(chrome://global/skin/icons/loading_16.png);
+  background-repeat: no-repeat;
+  background-position: center center;
+}
+
 .splitview-nav {
   -moz-appearance: none;
   margin: 0;
@@ -70,7 +76,6 @@
 
 .placeholder {
   -moz-box-flex: 1;
-  -moz-box-back: center;
   text-align: center;
 }
 

browser/themes/winstripe/devtools/styleeditor.css

@@ -36,6 +36,10 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#style-editor-chrome {
+  background-color: hsl(211,21%,26%);
+}
+
 .stylesheet-title,
 .stylesheet-name {
   text-decoration: none;

toolkit/content/Services.jsm

@@ -63,6 +63,8 @@ XPCOMUtils.defineLazyGetter(Services, "dirsvc", function () {
 });
 
 let initTable = [
+  ["appShell", "@mozilla.org/appshell/appShellService;1", "nsIAppShellService"],
+  ["cache", "@mozilla.org/network/cache-service;1", "nsICacheService"],
   ["console", "@mozilla.org/consoleservice;1", "nsIConsoleService"],
   ["contentPrefs", "@mozilla.org/content-pref/service;1", "nsIContentPrefService"],
   ["cookies", "@mozilla.org/cookiemanager;1", "nsICookieManager2"],