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

chrome/browser/extensions/extension_context_menu_model.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_EXTENSIONS_EXTENSION_CONTEXT_MENU_MODEL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_MODEL_H_
 
 #include "app/menus/simple_menu_model.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 
@@ skipping 46 matching lines @@
   // The extension action we are displaying the menu for (or NULL).
   ExtensionAction* extension_action_;
 
   Browser* browser_;
 
   Profile* profile_;
 
   // The delegate which handles the 'inspect popup' menu command (or NULL).
   PopupDelegate* delegate_;
 
+  // Keeps track of the extension install UI.
+  scoped_ptr<ExtensionInstallUI> install_ui_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionContextMenuModel);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_CONTEXT_MENU_MODEL_H_