Add notification mechanism when BrowserActionButton's icon has been updated.

chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h

Index: chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h
diff --git a/chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h b/chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h
index 15964e499672c793f2e7e5fb6a287e83cefabc33..6203c79a5fd8df5f8aeb7b568462b8f86afe016b 100644
--- a/chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h
+++ b/chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h
@@ -10,6 +10,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 
@@ -17,6 +18,8 @@ class Browser;
 class BrowserActionsContainer;
 class BrowserActionView;
 
+class IconUpdater;
+
 namespace views {
 class MenuRunner;
 class Widget;
@@ -115,6 +118,11 @@ class BrowserActionOverflowMenuController : public views::MenuDelegate {
   // Whether this controller is being used for drop.
   bool for_drop_;
 
+  // The vector keeps all icon updaters associated with menu item views in the
+  // controller. The icon updater will update the menu item view's icon when
+  // the browser action view's icon has been updated.
+  ScopedVector<IconUpdater> icon_updaters_;
+
   friend class base::DeleteHelper<BrowserActionOverflowMenuController>;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActionOverflowMenuController);