Attempt to load component extension favicon from the resources first.

chrome/browser/extensions/image_loading_tracker.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_
 #pragma once
 
 #include <map>
 
 #include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/gfx/size.h"
 
 class Extension;
 class SkBitmap;
 
 namespace gfx {
@@ skipping 93 matching lines @@
 
   // When an image has finished loaded and been resized on the file thread, it
   // is posted back to this method on the original thread.  This method then
   // calls the observer's OnImageLoaded and deletes the ImageLoadingTracker if
   // it was the last image in the list. The |original_size| should be the size
   // of the image before any resizing was done.
   // |image| may be null if the file failed to decode.
   void OnImageLoaded(SkBitmap* image, const ExtensionResource& resource,
                      const gfx::Size& original_size, int id, bool should_cache);
 
+  // Checks whether image is a component extension resource. Returns false
+  // if a given |resource| does not have a corresponding image in bundled
+  // resources. Otherwise fills |resource_id|.
+  bool IsComponentExtensionResource(const Extension* extension,
+                                    const ExtensionResource& resource,
+                                    int& resource_id) const;
+
   // content::NotificationObserver method. If an extension is uninstalled while
   // we're waiting for the image we remove the entry from load_map_.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // The view that is waiting for the image to load.
   Observer* observer_;
 
   // ID to use for next image requested. This is an ever increasing integer.
   int next_id_;
 
   // The object responsible for loading the image on the File thread.
   scoped_refptr<ImageLoader> loader_;
 
   // Information for each LoadImage request is cached here. The integer
   // identifies the id assigned to the request.
   LoadMap load_map_;
 
   content::NotificationRegistrar registrar_;
 
+  FRIEND_TEST_ALL_PREFIXES(ImageLoadingTrackerTest,
+                           IsComponentExtensionResource);
+
   DISALLOW_COPY_AND_ASSIGN(ImageLoadingTracker);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_IMAGE_LOADING_TRACKER_H_