Add support for KeyboardEvent.getModifierState()

Source/core/dom/KeyboardEvent.cpp

 /**
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 139 matching lines @@
     m_keyLocation = keyLocation;
     m_ctrlKey = ctrlKey;
     m_shiftKey = shiftKey;
     m_altKey = altKey;
     m_metaKey = metaKey;
     m_altGraphKey = altGraphKey;
 }
 
 bool KeyboardEvent::getModifierState(const String& keyIdentifier) const
 {
+    // FIXME: The following keyIdentifiers are not supported yet (crbug.com/265458):
+    // "AltGraph", "CapsLock", "Fn", "NumLock", "ScrollLock", "SymbolLock", "OS".

[garykac, 2013/07/29 16:18:00]

Note that we're working to clarify some of these keys in the current DOM3 WD.

For example, the "Fn" key is a hardware key used on keyboards with a limited
amount of physical space. It is not exposed to the key events.

Please let me know if you're planning on doing any work on this soon.

     if (keyIdentifier == "Control")
         return ctrlKey();
     if (keyIdentifier == "Shift")
         return shiftKey();
     if (keyIdentifier == "Alt")
         return altKey();
     if (keyIdentifier == "Meta")
         return metaKey();
     return false;
 }
@@ skipping 59 matching lines @@
 {
 }
 
 bool KeyboardEventDispatchMediator::dispatchEvent(EventDispatcher* dispatcher) const
 {
     // Make sure not to return true if we already took default action while handling the event.
     return EventDispatchMediator::dispatchEvent(dispatcher) && !event()->defaultHandled();
 }
 
 } // namespace WebCore