Add support for multiple icon sizes for Mac platform apps

chrome/browser/extensions/extension_icon_manager.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 16 matching lines @@
 
   // This returns a bitmap of width/height kFaviconSize, loaded either from an
   // entry specified in the extension's 'icon' section of the manifest, or a
   // default extension icon.
   const SkBitmap& GetIcon(const std::string& extension_id);
 
   // Removes the extension's icon from memory.
   void RemoveIcon(const std::string& extension_id);
 
   // Implements the ImageLoadingTracker::Observer interface.
-  virtual void OnImageLoaded(SkBitmap* image, const ExtensionResource& resource,
+  virtual void OnImageLoaded(const gfx::Image& image,
+                             const std::string& extension_id,
                              int index) OVERRIDE;
 
   void set_monochrome(bool value) { monochrome_ = value; }
   void set_padding(const gfx::Insets& value) { padding_ = value; }
 
  private:
   // Makes sure we've done one-time initialization of the default extension icon
   // default_icon_.
   void EnsureDefaultIcon();
 
@@ skipping 16 matching lines @@
   // If true, we will desaturate the icons to make them monochromatic.
   bool monochrome_;
 
   // Specifies the amount of empty padding to place around the icon.
   gfx::Insets padding_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionIconManager);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_MANAGER_H_