Made MenuController handle dynamic labels.

chrome/browser/app_menu_model.h

Index: chrome/browser/app_menu_model.h
diff --git a/chrome/browser/app_menu_model.h b/chrome/browser/app_menu_model.h
index 41343d40f6cb09108ce5db98de316aead3550a86..5dc5d443780effc1ffb955301ad0711b5ab07d19 100644
--- a/chrome/browser/app_menu_model.h
+++ b/chrome/browser/app_menu_model.h
@@ -20,15 +20,26 @@ class AppMenuModel : public menus::SimpleMenuModel {
                         Browser* browser);
   virtual ~AppMenuModel();
 
+  // Override this to handle the sync menu item (whose label is
+  // updated dynamically).
+  virtual bool IsLabelDynamicAt(int index) const;
+  virtual string16 GetLabelAt(int index) const;
+
  private:
   void Build();
   void BuildProfileSubMenu();
 
+  string16 GetSyncMenuLabel() const;
+  bool IsSyncItem(int index) const;
+
   // Contents of the profiles menu to populate with profile names.
   scoped_ptr<menus::SimpleMenuModel> profiles_menu_contents_;
 
   Browser* browser_;  // weak
 
+  bool sync_item_enabled_;
+  int sync_item_index_;  // -1 if sync_item_enabled_ is false.
+
   DISALLOW_COPY_AND_ASSIGN(AppMenuModel);
 };