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

chrome/browser/gtk/location_bar_view_gtk.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_GTK_LOCATION_BAR_VIEW_GTK_H_
 #define CHROME_BROWSER_GTK_LOCATION_BAR_VIEW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <map>
@@ skipping 175 matching lines @@
     }
 
     bool IsVisible() { return GTK_WIDGET_VISIBLE(widget()); }
 
     // Called to notify the PageAction 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, GURL url);
 
     // A callback from ImageLoadingTracker for when the image has loaded.
-    virtual void OnImageLoaded(SkBitmap* image, size_t index);
+    virtual void OnImageLoaded(SkBitmap* image, int index);
 
     // Simulate left mouse click on the page action button.
     void TestActivatePageAction();
 
     // Overridden from ExtensionContextMenuModel::PopupDelegate:
     virtual void InspectPopup(ExtensionAction* action);
 
    private:
     static gboolean OnButtonPressedThunk(GtkWidget* sender,
                                          GdkEvent* event,
@@ skipping 23 matching lines @@
     typedef std::map<std::string, GdkPixbuf*> PixbufMap;
     PixbufMap pixbufs_;
 
     // A cache of the last dynamically generated bitmap and the pixbuf that
     // corresponds to it. We keep track of both so we can free old pixbufs as
     // their icons are replaced.
     SkBitmap last_icon_skbitmap_;
     GdkPixbuf* last_icon_pixbuf_;
 
     // The object that is waiting for the image loading to complete
-    // asynchronously.  It will delete itself once it is done.
-    ImageLoadingTracker* tracker_;
+    // asynchronously.
+    ImageLoadingTracker tracker_;
 
     // The widgets for this page action.
     OwnedWidgetGtk event_box_;
     OwnedWidgetGtk image_;
 
     // The tab id we are currently showing the icon for.
     int current_tab_id_;
 
     // The URL we are currently showing the icon for.
     GURL current_url_;
@@ skipping 127 matching lines @@
   // Indicate if |tab_to_search_hint_| should be shown.
   bool show_keyword_hint_;
 
   // Indicate if |type_to_search_hint_| should be shown.
   bool show_search_hint_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarViewGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_LOCATION_BAR_VIEW_GTK_H_