Add app.window.setIcon

chrome/common/extensions/api/app_current_window_internal.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.
 
 // This is used by the app window API internally to pass through messages to
 // the shell window.
 [internal, nodoc] namespace app.currentWindowInternal {
 
   // TODO(asargent) - We need to add support for referencing types in
   // other namespaces (crbug.com/158654). For now just duplicate this
   // dictionary from app.window.
   dictionary Bounds {
     long? left;
     long? top;
     long? width;
     long? height;
   };
 
 
   interface Functions {
     static void focus();
     static void minimize();
     static void maximize();
     static void restore();
     static void drawAttention();
     static void clearAttention();
     static void show();
     static void hide();
     static void setBounds(Bounds bounds);
+    static void setIcon(DOMString icon_url);
   };
 
   interface Events {
     static void onClosed();
     static void onBoundsChanged();
     static void onMinimized();
     static void onMaximized();
     static void onRestored();
   };
 };