Bug 1389829 - Part 3 - Handle "View Page Source" on the JS side. r=esawin

MozReview-Commit-ID: AOmTcNQ7qlj

--HG--
extra : rebase_source : 24dcc129fa666980cc360afa2acd761768133171

mobile/android/chrome/content/browser.js

@@ -126,6 +126,7 @@ var lazilyLoadedBrowserScripts = [
   ["Linkifier", "chrome://browser/content/Linkify.js"],
   ["CastingApps", "chrome://browser/content/CastingApps.js"],
   ["RemoteDebugger", "chrome://browser/content/RemoteDebugger.js"],
+  ["gViewSourceUtils", "chrome://global/content/viewSourceUtils.js"],
 ];
 if (!AppConstants.RELEASE_OR_BETA) {
   lazilyLoadedBrowserScripts.push(
@@ -367,6 +368,7 @@ var BrowserApp = {
       "Tab:Closed",
       "Tab:Move",
       "Tab:OpenUri",
+      "Tab:ViewSource",
     ]);
 
     GlobalEventDispatcher.registerListener(this, [
@@ -1435,6 +1437,27 @@ var BrowserApp = {
     aTab.browser.dispatchEvent(evt);
   },
 
+  viewSourceForTab(aTab) {
+    let browser = aTab.browser;
+    let outerWindowID = browser.outerWindowID;
+    let url = browser.currentURI.spec;
+    let args = { browser, outerWindowID, URL: url };
+
+    // `viewSourceInBrowser` will load the source content from the page
+    // descriptor for the tab (when possible) or fallback to the network if
+    // that fails.  Either way, the view source module will manage the tab's
+    // location, so use "about:blank" here to avoid unnecessary redundant
+    // requests.
+    let tab = this.addTab("about:blank", {
+      selected: true,
+      parentId: aTab.id,
+      isPrivate: PrivateBrowsingUtils.isBrowserPrivate(aTab.browser)
+    });
+    args.viewSourceBrowser = tab.browser;
+
+    gViewSourceUtils.viewSourceInBrowser(args);
+  },
+
   quit: function quit(aClear = { sanitize: {}, dontSaveSession: false }) {
     // Notify all windows that an application quit has been requested.
     let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
@@ -1948,6 +1971,10 @@ var BrowserApp = {
       case "Tab:Move":
         this._handleTabMove(data.fromTabId, data.fromPosition, data.toTabId, data.toPosition);
         break;
+
+      case "Tab:ViewSource":
+        this.viewSourceForTab(this.getTabForId(data.tabId));
+        break;
     }
   },