DevTools: WI.Throttler goes promisified.

Source/devtools/front_end/elements/PlatformFontsWidget.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
  */
 WebInspector.PlatformFontsWidget.createSidebarWrapper = function(sharedModel)
 {
     var widget = new WebInspector.PlatformFontsWidget(sharedModel);
     return new WebInspector.ElementsSidebarViewWrapperPane(WebInspector.UIString("Fonts"), widget)
 }
 
 WebInspector.PlatformFontsWidget.prototype = {
     /**
      * @override
-     * @param {!WebInspector.Throttler.FinishCallback} finishedCallback
      * @protected
+     * @return {!Promise.<?>}
      */
-    doUpdate: function(finishedCallback)
+    doUpdate: function()
     {
         var cssModel = this._sharedModel.cssModel();
         var node = this._sharedModel.node();
-        if (!node || !cssModel) {
-            finishedCallback();
-            return;
-        }
-        cssModel.platformFontsPromise(node.id)
+        if (!node || !cssModel)
+            return Promise.resolve();
+
+        return cssModel.platformFontsPromise(node.id)
             .then(this._refreshUI.bind(this, node))
-            .then(finishedCallback)
-            .catch(/** @type {function()} */(finishedCallback));
     },
 
     /**
      * @param {!WebInspector.DOMNode} node
      * @param {?Array.<!CSSAgent.PlatformFontUsage>} platformFonts
      */
     _refreshUI: function(node, platformFonts)
     {
         if (this._sharedModel.node() !== node)
             return;
@@ skipping 18 matching lines @@
             fontDelimeterElement.textContent = "\u2014";
 
             var fontUsageElement = fontStatElement.createChild("span", "font-usage");
             var usage = platformFonts[i].glyphCount;
             fontUsageElement.textContent = usage === 1 ? WebInspector.UIString("%d glyph", usage) : WebInspector.UIString("%d glyphs", usage);
         }
     },
 
     __proto__: WebInspector.ThrottledWidget.prototype
 }