Eliminate all UI thread decoding of extension images....

chrome/browser/cocoa/location_bar_view_mac.h

 // Copyright (c) 2010 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_COCOA_LOCATION_BAR_VIEW_MAC_H_
 #define CHROME_BROWSER_COCOA_LOCATION_BAR_VIEW_MAC_H_
 
 #include <string>
 #include <map>
 #include <vector>
@@ skipping 223 matching lines @@
     // When a new page action is created, all the icons are destroyed and
     // recreated; at this point we need to calculate sizes to lay out the
     // icons even though no images are available yet.  For this case, we return
     // the default image size for a page icon.
     virtual NSSize GetPreferredImageSize();
 
     // Either notify listeners or show a popup depending on the Page Action.
     virtual void OnMousePressed(NSRect bounds);
 
     // Overridden from ImageLoadingTracker.
-    virtual void OnImageLoaded(SkBitmap* image, size_t index);
+    virtual void OnImageLoaded(SkBitmap* image, int index);
 
     // Called to notify the Page Action that it should determine whether to be
     // visible or hidden. |contents| is the TabContents that is active, |url|
     // is the current page URL.
     void UpdateVisibility(TabContents* contents, const GURL& url);
 
     // Sets the tooltip for this Page Action image.
     void SetToolTip(NSString* tooltip);
     void SetToolTip(std::string tooltip);
 
@@ skipping 173 matching lines @@
   // The transition type to use for the navigation.
   PageTransition::Type transition_;
 
   // Used to register for notifications received by NotificationObserver.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarViewMac);
 };
 
 #endif  // CHROME_BROWSER_COCOA_LOCATION_BAR_VIEW_MAC_H_