Only dispatch menu events if they have a valid target.

ui/views/controls/menu/menu_event_dispatcher_linux.cc

 // Copyright 2014 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/views/controls/menu/menu_event_dispatcher_linux.h"
 
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/window.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/views/controls/menu/menu_controller.h"
+#include "ui/views/widget/widget.h"
 
 namespace views {
 namespace internal {
 
 MenuEventDispatcher::MenuEventDispatcher(MenuController* controller)
     : menu_controller_(controller) {}
 
 MenuEventDispatcher::~MenuEventDispatcher() {}
 
 bool MenuEventDispatcher::CanDispatchEvent(const ui::PlatformEvent& event) {
   return true;
 }
 
 uint32_t MenuEventDispatcher::DispatchEvent(const ui::PlatformEvent& event) {
   bool should_quit = false;
   bool should_perform_default = true;
+  bool should_process_event = true;
+
+  // Check if the event should be handled.
+  scoped_ptr<ui::Event> ui_event(ui::EventFromNative(event));
+  if (ui_event && menu_controller_->owner()) {
+    aura::Window* menu_window = menu_controller_->owner()->GetNativeWindow();
+    aura::Window* target_window = static_cast<aura::Window*>(
+        static_cast<ui::EventTarget*>(menu_window->GetRootWindow())->
+            GetEventTargeter()->FindTargetForEvent(menu_window,
+                                                   ui_event.get()));
+    // TODO(flackr): The event shouldn't be handled if target_window is not
+    // menu_window, however the event targeter does not properly target the
+    // open menu. For now, we allow targeters to prevent handling by the menu.
+    if (!target_window)
+      should_process_event = false;
+  }
+
   if (menu_controller_->exit_type() == MenuController::EXIT_ALL ||
       menu_controller_->exit_type() == MenuController::EXIT_DESTROYED) {
     should_quit = true;
-  } else {
+  } else if (should_process_event) {
     switch (ui::EventTypeFromNative(event)) {
       case ui::ET_KEY_PRESSED: {
         if (!menu_controller_->OnKeyDown(ui::KeyboardCodeFromNative(event))) {
           should_quit = true;
           should_perform_default = false;
           break;
         }
 
         // Do not check mnemonics if the Alt or Ctrl modifiers are pressed.
         int flags = ui::EventFlagsFromNative(event);
@@ skipping 21 matching lines @@
 
   if (should_quit || menu_controller_->exit_type() != MenuController::EXIT_NONE)
     menu_controller_->TerminateNestedMessageLoop();
 
   return should_perform_default ? ui::POST_DISPATCH_PERFORM_DEFAULT
                                 : ui::POST_DISPATCH_NONE;
 }
 
 }  // namespace internal
 }  // namespace views