Attempt to load component extension favicon from the resources first.

chrome/browser/extensions/image_loading_tracker.h

Index: chrome/browser/extensions/image_loading_tracker.h
===================================================================
--- chrome/browser/extensions/image_loading_tracker.h	(revision 133434)
+++ chrome/browser/extensions/image_loading_tracker.h	(working copy)
@@ -9,6 +9,7 @@
 #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"
@@ -122,6 +123,13 @@
   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,
@@ -143,6 +151,9 @@
 
   content::NotificationRegistrar registrar_;
 
+  FRIEND_TEST_ALL_PREFIXES(ImageLoadingTrackerTest,
+                           IsComponentExtensionResource);
+
   DISALLOW_COPY_AND_ASSIGN(ImageLoadingTracker);
 };