Only dispatch menu events if they have a valid target.

ui/events/event_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_EVENT_UTILS_H_
 #define UI_EVENTS_EVENT_UTILS_H_
 
 #include "base/event_types.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/events/events_export.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace gfx {
 class Point;
 class Vector2d;
 }
 
 namespace base {
 class TimeDelta;
 }
 
 namespace ui {
 
 class Event;
 
 // Updates the list of devices for cached properties.
 EVENTS_EXPORT void UpdateDeviceList();
 
+// Returns a ui::Event wrapping a native event. Ownership of the returned value
+// is transferred to the caller.
+EVENTS_EXPORT scoped_ptr<Event> EventFromNative(
+    const base::NativeEvent& native_event);
+
 // Get the EventType from a native event.
 EVENTS_EXPORT EventType EventTypeFromNative(
     const base::NativeEvent& native_event);
 
 // Get the EventFlags from a native event.
 EVENTS_EXPORT int EventFlagsFromNative(const base::NativeEvent& native_event);
 
 // Get the timestamp from a native event.
 EVENTS_EXPORT base::TimeDelta EventTimeFromNative(
     const base::NativeEvent& native_event);
@@ skipping 111 matching lines @@
 EVENTS_EXPORT uint16 GetScanCodeFromLParam(LPARAM lParam);
 EVENTS_EXPORT LPARAM GetLParamFromScanCode(uint16 scan_code);
 #endif
 
 // Registers a custom event type.
 EVENTS_EXPORT int RegisterCustomEventType();
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_UTILS_H_