Pop extensions out of the action overflow menu

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 069bcf5729da8c9acdb5945d4e20d679b1ac1d1f..e9d444f43f30bb1163fc0fb98b539602db4b0741 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
@@ -28,11 +28,14 @@ class Widget;
 // drag and drop, etc). This class manages its own lifetime.
 class BrowserActionOverflowMenuController : public views::MenuDelegate {
  public:
-  // The observer is notified prior to the menu being deleted.
   class Observer {
    public:
+    // Called prior to this menu being deleted.
     virtual void NotifyMenuDeleted(
         BrowserActionOverflowMenuController* controller) = 0;
+
+    // Called when an extension action has been moved to the overflow menu.
+    virtual void NotifyActionMovedToOverflow() = 0;
   };
 
   BrowserActionOverflowMenuController(