DevTools: WI.Throttler goes promisified.

Source/devtools/front_end/ui/ThrottledWidget.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.Widget}
  */
 WebInspector.ThrottledWidget = function()
 {
     WebInspector.Widget.call(this);
     this._updateThrottler = new WebInspector.Throttler(100);
     this._updateWhenVisible = false;
 }
 
 WebInspector.ThrottledWidget.prototype = {
     /**
-     * @param {!WebInspector.Throttler.FinishCallback} finishedCallback
      * @protected
+     * @return {!Promise.<?>}
      */
-    doUpdate: function(finishedCallback)
+    doUpdate: function()
     {
-        finishedCallback();
+        return Promise.resolve();
     },
 
     update: function()
     {
         this._updateWhenVisible = !this.isShowing();
         if (this._updateWhenVisible)
             return;
         this._updateThrottler.schedule(innerUpdate.bind(this));
 
         /**
-         * @param {!WebInspector.Throttler.FinishCallback} finishedCallback
          * @this {WebInspector.ThrottledWidget}
+         * @return {!Promise.<?>}
          */
-        function innerUpdate(finishedCallback)
+        function innerUpdate()
         {
             if (this.isShowing()) {
-                this.doUpdate(finishedCallback);
+                return this.doUpdate();
             } else {
                 this._updateWhenVisible = true;
-                finishedCallback();
+                return Promise.resolve();
             }
         }
     },
 
     /**
      * @override
      */
     wasShown: function()
     {
         WebInspector.Widget.prototype.wasShown.call(this);
         if (this._updateWhenVisible)
             this.update();
     },
 
     __proto__: WebInspector.Widget.prototype
 }