Ensure that menus put in Chrome ASH on Windows 8 are operatable using the keyboard.

win8/metro_driver/chrome_app_view_ash.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 WIN8_METRO_DRIVER_CHROME_APP_VIEW_ASH_H_
 #define WIN8_METRO_DRIVER_CHROME_APP_VIEW_ASH_H_
 
 #include <windows.applicationmodel.core.h>
 #include <windows.ui.core.h>
 #include <windows.ui.input.h>
@@ skipping 68 matching lines @@
 
   HRESULT OnWheel(winui::Core::ICoreWindow* sender,
                   winui::Core::IPointerEventArgs* args);
 
   HRESULT OnKeyDown(winui::Core::ICoreWindow* sender,
                     winui::Core::IKeyEventArgs* args);
 
   HRESULT OnKeyUp(winui::Core::ICoreWindow* sender,
                   winui::Core::IKeyEventArgs* args);
 
+  // Invoked for system keys like Alt, etc.
+  HRESULT OnAcceleratorKeyDown(winui::Core::ICoreDispatcher* sender,
+                               winui::Core::IAcceleratorKeyEventArgs* args);
+
   HRESULT OnCharacterReceived(winui::Core::ICoreWindow* sender,
                               winui::Core::ICharacterReceivedEventArgs* args);
 
   HRESULT OnVisibilityChanged(winui::Core::ICoreWindow* sender,
                               winui::Core::IVisibilityChangedEventArgs* args);
 
   mswr::ComPtr<winui::Core::ICoreWindow> window_;
   mswr::ComPtr<winapp::Core::ICoreApplicationView> view_;
   EventRegistrationToken activated_token_;
   EventRegistrationToken pointermoved_token_;
   EventRegistrationToken pointerpressed_token_;
   EventRegistrationToken pointerreleased_token_;
   EventRegistrationToken wheel_token_;
   EventRegistrationToken keydown_token_;
   EventRegistrationToken keyup_token_;
   EventRegistrationToken character_received_token_;
   EventRegistrationToken visibility_changed_token_;
+  EventRegistrationToken accel_keydown_token_;
+  EventRegistrationToken accel_keyup_token_;
 
   // Keep state about which button is currently down, if any, as PointerMoved
   // events do not contain that state, but Ash's MouseEvents need it.
   ui::EventFlags mouse_down_flags_;
 
   metro_driver::Direct3DHelper direct3d_helper_;
 
   IPC::ChannelProxy* ui_channel_;
 };
 
 #endif  // WIN8_METRO_DRIVER_CHROME_APP_VIEW_ASH_H_