Add support for multiple icon sizes for Mac platform apps

chrome/browser/ui/views/aura/launcher/launcher_updater.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 "chrome/browser/ui/views/aura/launcher/launcher_updater.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
@@ skipping 128 matching lines @@
     TabContentsWrapper** tab) {
   *tab = NULL;
   for (Instances::const_iterator i = instances_->begin();
        i != instances_->end(); ++i) {
     if ((*i)->ContainsID(id, tab))
       return *i;
   }
   return NULL;
 }
 
-void LauncherUpdater::SetAppImage(TabContentsWrapper* tab, SkBitmap* image) {
+void LauncherUpdater::SetAppImage(TabContentsWrapper* tab,
+                                  const SkBitmap* image) {
   if (app_map_.find(tab) == app_map_.end())
     return;
 
   int model_index = launcher_model_->ItemIndexByID(app_map_[tab].id);
   ash::LauncherItem item = launcher_model_->items()[model_index];
   item.image = image ? *image : Extension::GetDefaultIcon(true);
   launcher_model_->Set(model_index, item);
 }
 
 void LauncherUpdater::SetAppIconLoaderForTest(AppIconLoader* loader) {
@@ skipping 229 matching lines @@
     return true;
   for (AppTabMap::const_iterator i = app_map_.begin(); i != app_map_.end();
        ++i) {
     if (i->second.id == id) {
       *tab = i->first;
       return true;
     }
   }
   return false;
 }