Only dispatch menu events if they have a valid target.

ui/events/event_utils.cc

 // 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.
 
 #include "ui/events/event_utils.h"
 
 #include <vector>
 
 #include "ui/events/event.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
 namespace ui {
 
 namespace {
 int g_custom_event_types = ET_LAST;
 }  // namespace
 
+Event* EventFromNative(const base::NativeEvent& native_event) {
+  EventType type = EventTypeFromNative(native_event);
+  switch(type) {
+    case ET_KEY_PRESSED:
+    case ET_KEY_RELEASED:
+      return new KeyEvent(native_event, false);
+
+    case ET_TRANSLATED_KEY_PRESS:
+    case ET_TRANSLATED_KEY_RELEASE:
+      return new TranslatedKeyEvent(native_event, false);
+
+    case ET_MOUSE_PRESSED:
+    case ET_MOUSE_DRAGGED:
+    case ET_MOUSE_RELEASED:
+    case ET_MOUSE_MOVED:
+    case ET_MOUSE_ENTERED:
+    case ET_MOUSE_EXITED:
+      return new MouseEvent(native_event);
+
+    case ET_MOUSEWHEEL:
+      return new MouseWheelEvent(native_event);
+
+    case ET_SCROLL_FLING_START:
+    case ET_SCROLL_FLING_CANCEL:
+    case ET_SCROLL:
+      return new ScrollEvent(native_event);
+
+    case ET_TOUCH_RELEASED:
+    case ET_TOUCH_PRESSED:
+    case ET_TOUCH_MOVED:
+    case ET_TOUCH_CANCELLED:
+      return new TouchEvent(native_event);
+
+    default:
+      return NULL;
+  }
+}
+
 int RegisterCustomEventType() {
   return ++g_custom_event_types;
 }
 
 base::TimeDelta EventTimeForNow() {
   return base::TimeDelta::FromInternalValue(
       base::TimeTicks::Now().ToInternalValue());
 }
 
 bool ShouldDefaultToNaturalScroll() {
   return GetInternalDisplayTouchSupport() ==
       gfx::Display::TOUCH_SUPPORT_AVAILABLE;
 }
 
 gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
   // No screen in some unit tests.
   if (!screen)
     return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
   const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
   for (std::vector<gfx::Display>::const_iterator it = displays.begin();
        it != displays.end(); ++it) {
     if (it->IsInternal())
       return it->touch_support();
   }
   return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
 }
 
 }  // namespace ui