Add experimental Support for DOM3 KeyboardEvent key value

Source/core/events/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 79 matching lines @@
     , m_isAutoRepeat(false)
 {
 }
 
 KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, AbstractView* view)
     : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()),
                           true, true, view, 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey())
     , m_keyEvent(adoptPtr(new PlatformKeyboardEvent(key)))
     , m_keyIdentifier(key.keyIdentifier())
     , m_code(key.code())
+    , m_key(key.key())
     , m_location(keyLocationCode(key))
     , m_isAutoRepeat(key.isAutoRepeat())

[Wez, 2015/03/04 23:00:25]

Not specific to this CL but perhaps rbyers@ can comment - can we use constructor
delegation now in Blink, to simplify these?

 {
     setUICreateTime(key.timestamp());
 }
 
 KeyboardEvent::KeyboardEvent(const AtomicString& eventType, const KeyboardEventInit& initializer)
     : UIEventWithKeyState(eventType, initializer.bubbles(), initializer.cancelable(), initializer.view(), initializer.detail(), initializer.ctrlKey(), initializer.altKey(), initializer.shiftKey(), initializer.metaKey())
     , m_keyIdentifier(initializer.keyIdentifier())
     , m_location(initializer.location())
     , m_isAutoRepeat(initializer.repeat())
 {
 }
 
 KeyboardEvent::KeyboardEvent(const AtomicString& eventType, bool canBubble, bool cancelable, AbstractView *view,
-    const String& keyIdentifier, const String& code, unsigned location, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
+    const String& keyIdentifier, const String& code, const String& key, unsigned location, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
     : UIEventWithKeyState(eventType, canBubble, cancelable, view, 0, ctrlKey, altKey, shiftKey, metaKey)
     , m_keyIdentifier(keyIdentifier)
     , m_code(code)
+    , m_key(key)
     , m_location(location)
     , m_isAutoRepeat(false)
 {
 }
 
 KeyboardEvent::~KeyboardEvent()
 {
 }
 
 void KeyboardEvent::initKeyboardEvent(const AtomicString& type, bool canBubble, bool cancelable, AbstractView* view,
@@ skipping 92 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 blink