Mac[Views]: Make native menus more responsive by pumping private runloop modes.

ui/base/cocoa/menu_controller.h

Index: ui/base/cocoa/menu_controller.h
diff --git a/ui/base/cocoa/menu_controller.h b/ui/base/cocoa/menu_controller.h
index 7e8e4acfcd8c7d27643ed0d1616f4472a10350d2..09d7974cf6731f6375cf07ffdffca9e5ea736f1a 100644
--- a/ui/base/cocoa/menu_controller.h
+++ b/ui/base/cocoa/menu_controller.h
@@ -27,13 +27,18 @@ UI_BASE_EXPORT extern NSString* const kMenuControllerMenuDidCloseNotification;
 UI_BASE_EXPORT
 @interface MenuController : NSObject<NSMenuDelegate> {
  @protected
-  ui::MenuModel* model_;  // weak
+  ui::MenuModel* model_;  // Weak.
   base::scoped_nsobject<NSMenu> menu_;
-  BOOL useWithPopUpButtonCell_;  // If YES, 0th item is blank
-  BOOL isMenuOpen_;
 }
 
 @property(nonatomic, assign) ui::MenuModel* model;
+
+// Whether to activate selected menu items via a posted task. This may allow the
+// selection to be handled earlier, whilst the menu is fading out. If the posted
+// task wasn't processed by the time the action is normally sent, it will be
+// sent synchronously at that stage.
+@property(nonatomic, assign) BOOL postItemSelectedAsTask;
+
 // Note that changing this will have no effect if you use
 // |-initWithModel:useWithPopUpButtonCell:| or after the first call to |-menu|.
 @property(nonatomic) BOOL useWithPopUpButtonCell;