Create Document exitPointerLock and pointerLockElement API methods.

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 921 matching lines @@
     void setContainsValidityStyleRules() { m_containsValidityStyleRules = true; }
 
     void enqueueResizeEvent();
     void enqueueScrollEventForNode(Node*);
     void enqueueAnimationFrameEvent(PassRefPtrWillBeRawPtr<Event>);
 
     bool hasFullscreenElementStack() const { return m_hasFullscreenElementStack; }
     void setHasFullscreenElementStack() { m_hasFullscreenElementStack = true; }
 
     void webkitExitPointerLock();
+    void exitPointerLock();
     Element* webkitPointerLockElement() const;
+    Element* pointerLockElement() const;
 
     // Used to allow element that loads data without going through a FrameLoader to delay the 'load' event.
     void incrementLoadEventDelayCount() { ++m_loadEventDelayCount; }
     void decrementLoadEventDelayCount();
     void checkLoadEventSoon();
     bool isDelayingLoadEvent();
     void loadPluginsSoon();
 
     PassRefPtrWillBeRawPtr<Touch> createTouch(DOMWindow*, EventTarget*, int identifier, int pageX, int pageY, int screenX, int screenY, int radiusX, int radiusY, float rotationAngle, float force) const;
     PassRefPtrWillBeRawPtr<TouchList> createTouchList(WillBeHeapVector<RefPtrWillBeMember<Touch> >&) const;
@@ skipping 495 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h