Bug 1378817 - Stop using sdk/lang/functional in DevTools. r=jdescottes

MozReview-Commit-ID: CXMu5a0KNGT

--HG--
extra : rebase_source : acdb62a83a4f27c566ea6c9dabf0d0dce9b253e0

devtools/client/memory/components/tree-map/canvas-utils.js

@@ -15,7 +15,7 @@
  * view of the visualization is drawn onto this canvas, providing a crisp zoomed
  * in view of the tree map.
  */
-const { debounce } = require("sdk/lang/functional");
+const { debounce } = require("devtools/shared/debounce");
 const EventEmitter = require("devtools/shared/event-emitter");
 
 const HTML_NS = "http://www.w3.org/1999/xhtml";

devtools/client/memory/components/tree-map/drag-zoom.js

@@ -4,7 +4,7 @@
 
 "use strict";
 
-const { debounce } = require("sdk/lang/functional");
+const { debounce } = require("devtools/shared/debounce");
 const { lerp } = require("devtools/client/memory/utils");
 const EventEmitter = require("devtools/shared/event-emitter");
 

devtools/client/webaudioeditor/views/context.js

@@ -5,7 +5,7 @@
 
 /* import-globals-from ../includes.js */
 
-const { debounce } = require("sdk/lang/functional");
+const { debounce } = require("devtools/shared/debounce");
 const flags = require("devtools/shared/flags");
 
 // Globals for d3 stuff

devtools/shared/debounce.js

@@ -0,0 +1,39 @@
+/* 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";
+
+/**
+ * From underscore's `_.debounce`
+ * http://underscorejs.org
+ * (c) 2009-2014 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Underscore may be freely distributed under the MIT license.
+ *
+ * [and in turn extracted from "sdk/lang/functional/concurrent.js"]
+ */
+exports.debounce = function (fn, wait) {
+  let timeout, args, context, timestamp, result;
+
+  let later = function () {
+    let last = Date.now() - timestamp;
+    if (last < wait) {
+      timeout = setTimeout(later, wait - last);
+    } else {
+      timeout = null;
+      result = fn.apply(context, args);
+      context = args = null;
+    }
+  };
+
+  return function (...aArgs) {
+    context = this;
+    args = aArgs;
+    timestamp  = Date.now();
+    if (!timeout) {
+      timeout = setTimeout(later, wait);
+    }
+
+    return result;
+  };
+};

devtools/shared/moz.build

@@ -46,6 +46,7 @@ DevToolsModules(
     'async-utils.js',
     'builtin-modules.js',
     'content-observer.js',
+    'debounce.js',
     'defer.js',
     'deprecated-sync-thenables.js',
     'DevToolsUtils.js',