Creat a KeyboardEventManager class

third_party/WebKit/Source/platform/PlatformKeyboardEvent.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Collabora, Ltd.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 72 matching lines @@
 
     int nativeVirtualKeyCode() const { return m_nativeVirtualKeyCode; }
 
     bool isAutoRepeat() const { return getModifiers() & IsAutoRepeat; }
     bool isKeypad() const { return getModifiers() & IsKeyPad; }
     bool isSystemKey() const { return m_isSystemKey; }
 
     PLATFORM_EXPORT static bool currentCapsLockState();
     PLATFORM_EXPORT static Modifiers getCurrentModifierState();
 
+    // Returns accesskey activator used in page keyboard shortcuts in Chrome.
+    // See https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/accesskey.
+    PLATFORM_EXPORT static PlatformEvent::Modifiers accessKeyModifiers();
+
 protected:
     String m_text;
     String m_unmodifiedText;
     String m_keyIdentifier;
     String m_code;
     String m_key;
     int m_windowsVirtualKeyCode;
     int m_nativeVirtualKeyCode;
     bool m_isSystemKey;
 
 private:
     friend class Internals;
     enum OverrideCapsLockState {
         Default,
         On,
         Off
     };
     // Allows overriding the current caps lock state for testing purposes.
     PLATFORM_EXPORT static void setCurrentCapsLockState(OverrideCapsLockState state) { s_overrideCapsLockState = state; }
     PLATFORM_EXPORT static OverrideCapsLockState s_overrideCapsLockState;
 };
 
 } // namespace blink
 
 #endif // PlatformKeyboardEvent_h