Tracing for NSMenu timelines

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..71ce43b4cd53c413c100cd93b50202a31396c730 100644
--- a/ui/base/cocoa/menu_controller.h
+++ b/ui/base/cocoa/menu_controller.h
@@ -29,6 +29,7 @@ UI_BASE_EXPORT
  @protected
   ui::MenuModel* model_;  // weak
   base::scoped_nsobject<NSMenu> menu_;
+  BOOL suppressNextItemSelected_;  // Set by -processItemSelectedEarly:.
   BOOL useWithPopUpButtonCell_;  // If YES, 0th item is blank
   BOOL isMenuOpen_;
 }
@@ -57,6 +58,16 @@ UI_BASE_EXPORT
 // Programmatically close the constructed menu.
 - (void)cancel;
 
+// Called when the user chooses a particular menu item. |sender| is the menu
+// item chosen.
+- (void)itemSelected:(id)sender;
+
+// Sent when the menu item is clicked. A subclass can invoke itemSelected: and
+// return YES to suppress the action processing that occurs 300ms later, after
+// the native menu animations have completed. Consumers should not assume that
+// this method will be invoked.
+- (BOOL)processItemSelectedEarly:(id)sender;
+
 // Access to the constructed menu if the complex initializer was used. If the
 // default initializer was used, then this will create the menu on first call.
 - (NSMenu*)menu;