Implement requestIdleCallback API

Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 1246 matching lines @@
 
     IntRect fr = host->chromeClient().windowRect();
     IntSize dest = IntSize(width, height);
     IntRect update(fr.location(), dest);
     host->chromeClient().setWindowRectWithAdjustment(update);
 }
 
 int LocalDOMWindow::requestAnimationFrame(FrameRequestCallback* callback)
 {
     callback->m_useLegacyTimeBase = false;
-    if (Document* d = document())
-        return d->requestAnimationFrame(callback);
+    if (Document* doc = document())
+        return doc->requestAnimationFrame(callback);
     return 0;
 }
 
 int LocalDOMWindow::webkitRequestAnimationFrame(FrameRequestCallback* callback)
 {
     callback->m_useLegacyTimeBase = true;
-    if (Document* d = document())
-        return d->requestAnimationFrame(callback);
+    if (Document* document = this->document())
+        return document->requestAnimationFrame(callback);
     return 0;
 }
 
 void LocalDOMWindow::cancelAnimationFrame(int id)
 {
-    if (Document* d = document())
-        d->cancelAnimationFrame(id);
+    if (Document* document = this->document())
+        document->cancelAnimationFrame(id);
+}
+
+int LocalDOMWindow::requestIdleCallback(IdleRequestCallback* callback, double timeoutMillis)
+{
+    if (Document* document = this->document())
+        return document->requestIdleCallback(callback, timeoutMillis);
+    return 0;
+}
+
+void LocalDOMWindow::cancelIdleCallback(int id)
+{
+    if (Document* document = this->document())
+        document->cancelIdleCallback(id);
 }
 
 bool LocalDOMWindow::addEventListener(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener> prpListener, bool useCapture)
 {
     RefPtrWillBeRawPtr<EventListener> listener = prpListener;
     if (!EventTarget::addEventListener(eventType, listener, useCapture))
         return false;
 
     if (frame() && frame()->host())
         frame()->host()->eventHandlerRegistry().didAddEventHandler(*this, eventType);
@@ skipping 193 matching lines @@
     DOMWindow::trace(visitor);
     DOMWindowLifecycleNotifier::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     return m_frameObserver->frame();
 }
 
 } // namespace blink