Add support for multiple icon sizes for Mac platform apps

ui/gfx/image/image.cc

 // 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.
 
 #include "ui/gfx/image/image.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 289 matching lines @@
 }
 #endif
 
 #if defined(OS_MACOSX)
 NSImage* Image::ToNSImage() const {
   internal::ImageRep* rep = GetRepresentation(Image::kImageRepCocoa);
   return rep->AsImageRepCocoa()->image();
 }
 #endif
 
-const SkBitmap* Image::CopySkBitmap() const {
+SkBitmap* Image::CopySkBitmap() const {
   return new SkBitmap(*ToSkBitmap());
 }
 
 #if defined(TOOLKIT_USES_GTK)
 GdkPixbuf* Image::CopyGdkPixbuf() const {
   GdkPixbuf* pixbuf = ToGdkPixbuf();
   g_object_ref(pixbuf);
   return pixbuf;
 }
 #endif
@@ skipping 145 matching lines @@
   return GetRepresentation(Image::kImageRepSkia)->AsImageRepSkia()->
       bitmaps().size();
 }
 
 const SkBitmap* Image::GetSkBitmapAtIndex(size_t index) const {
   return GetRepresentation(Image::kImageRepSkia)->AsImageRepSkia()->
       bitmaps()[index];
 }
 
 }  // namespace gfx