Swap main menu with app-specific menu when app window focused.

chrome/browser/app_controller_mac.h

Index: chrome/browser/app_controller_mac.h
diff --git a/chrome/browser/app_controller_mac.h b/chrome/browser/app_controller_mac.h
index 46d8a051f3328c97b1c4c7ab344bd5879ebd9835..642112528d0b9721ecb9e74b637f295e2e0b6513 100644
--- a/chrome/browser/app_controller_mac.h
+++ b/chrome/browser/app_controller_mac.h
@@ -17,6 +17,7 @@
 #include "ui/base/work_area_watcher_observer.h"
 
 class AppControllerProfileObserver;
+@class AppMenuController;
 class BookmarkMenuBridge;
 class CommandUpdater;
 class GURL;
@@ -81,6 +82,9 @@ class WorkAreaWatcherObserver;
 
   scoped_ptr<PrefChangeRegistrar> profilePrefRegistrar_;
   PrefChangeRegistrar localPrefRegistrar_;
+
+  // Controller that manages main menu items for packaged app.
+  base::scoped_nsobject<AppMenuController> appMenuController_;
 }
 
 @property(readonly, nonatomic) BOOL startupComplete;