Give platform apps control over launcher right-click context menu.

chrome/browser/ui/app_list/extension_app_item.h

Index: chrome/browser/ui/app_list/extension_app_item.h
diff --git a/chrome/browser/ui/app_list/extension_app_item.h b/chrome/browser/ui/app_list/extension_app_item.h
index a9a1c9b7dcef21ab4de925c4f0c8aaf73ac055ef..3080f9fc09ed995d7c14f7255241ca318de170a5 100644
--- a/chrome/browser/ui/app_list/extension_app_item.h
+++ b/chrome/browser/ui/app_list/extension_app_item.h
@@ -18,6 +18,7 @@ class Profile;
 class SkBitmap;
 
 namespace extensions {
+class ContextMenuManager;
 class Extension;
 }
 
@@ -72,6 +73,7 @@ class ExtensionAppItem : public ChromeAppListItem,
 
   scoped_ptr<ImageLoadingTracker> tracker_;
   scoped_ptr<ui::SimpleMenuModel> context_menu_model_;
+  scoped_ptr<extensions::ContextMenuManager> context_menu_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppItem);
 };