Enhance chrome.app.window API with icon property

extensions/common/api/app_window.idl

 // Copyright (c) 2012 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.
 
 // Use the <code>chrome.app.window</code> API to create windows. Windows
 // have an optional frame with title bar and size controls. They are not
 // associated with any Chrome browser windows. See the <a
 // href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/samples/window-state">
 // Window State Sample</a> for a demonstration of these options.
 namespace app.window {
@@ skipping 213 matching lines @@
     // extensions.
     // Requires the <code>app.window.ime</code> API permission.
     [nodoc] boolean? ime;
 
     // If true, the window will have its own shelf icon. Otherwise the window
     // will be grouped in the shelf with other windows that are associated with
     // the app. Defaults to false. If showInShelf is set to true you need to
     // specify an id for the window.
     boolean? showInShelf;
 
+    // URL of the window icon. A window can have its own icon when showInShelf
+    // is set to true. The URL should be a global or an extension local URL.
+    DOMString? icon;
+
     // Frame type: <code>none</code> or <code>chrome</code> (defaults to
     // <code>chrome</code>). For <code>none</code>, the
     // <code>-webkit-app-region</code> CSS property can be used to apply
     // draggability to the app's window. <code>-webkit-app-region: drag</code>
     // can be used to mark regions draggable. <code>no-drag</code> can be used
     // to disable this style on nested elements.
     //
     // Use of <code>FrameOptions</code> is new in M36.
     (DOMString or FrameOptions)? frame;
 
@@ skipping 238 matching lines @@
     // Fired when the window is restored from being minimized or maximized.
     [nocompile] static void onRestored();
 
     // Fired when the window's ability to use alpha transparency changes.
     [nocompile, nodoc] static void onAlphaEnabledChanged();
 
     // Event for testing. Lets tests wait until a window has been shown.
     [nocompile, nodoc] static void onWindowFirstShown();
   };
 };