Views: Expose an on_closed callback via the MenuRunner constructor.

ui/views/controls/menu/menu_runner_impl_cocoa.h

Index: ui/views/controls/menu/menu_runner_impl_cocoa.h
diff --git a/ui/views/controls/menu/menu_runner_impl_cocoa.h b/ui/views/controls/menu/menu_runner_impl_cocoa.h
index bb5f4b861dee6bac0197991b1ebe704c8378efa5..4b4184ca6459e08049203dac47da7a530b46471e 100644
--- a/ui/views/controls/menu/menu_runner_impl_cocoa.h
+++ b/ui/views/controls/menu/menu_runner_impl_cocoa.h
@@ -5,13 +5,13 @@
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_RUNNER_IMPL_COCOA_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_RUNNER_IMPL_COCOA_H_
 
-#include "ui/views/controls/menu/menu_runner_impl_interface.h"
-
 #include <stdint.h>
 
+#include "base/callback.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/time/time.h"
+#include "ui/views/controls/menu/menu_runner_impl_interface.h"
 
 @class MenuController;
 
@@ -21,7 +21,8 @@ namespace internal {
 // A menu runner implementation that uses NSMenu to show a context menu.
 class VIEWS_EXPORT MenuRunnerImplCocoa : public MenuRunnerImplInterface {
  public:
-  explicit MenuRunnerImplCocoa(ui::MenuModel* menu);
+  MenuRunnerImplCocoa(ui::MenuModel* menu,
+                      const base::Closure& on_menu_closed_callback);
 
   bool IsRunning() const override;
   void Release() override;
@@ -48,6 +49,9 @@ class VIEWS_EXPORT MenuRunnerImplCocoa : public MenuRunnerImplInterface {
   // The timestamp of the event which closed the menu - or 0.
   base::TimeTicks closing_event_time_;
 
+  // Invoked before RunMenuAt() returns, except upon a Release().
+  base::Closure on_menu_closed_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(MenuRunnerImplCocoa);
 };