Implement requestIdleCallback API

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
diff --git a/Source/core/frame/LocalDOMWindow.cpp b/Source/core/frame/LocalDOMWindow.cpp
index 0ffefbc9f3026c909f369bca438422e598acdad5..e17eb4d4e1d99835b3e34f5e01637eb1884d085a 100644
--- a/Source/core/frame/LocalDOMWindow.cpp
+++ b/Source/core/frame/LocalDOMWindow.cpp
@@ -1264,23 +1264,36 @@ void LocalDOMWindow::resizeTo(int width, int height) const
 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* doc = document())
+        return doc->requestAnimationFrame(callback);
     return 0;
 }
 
 void LocalDOMWindow::cancelAnimationFrame(int id)
 {
-    if (Document* d = document())
-        d->cancelAnimationFrame(id);
+    if (Document* doc = document())
+        doc->cancelAnimationFrame(id);
+}
+
+int LocalDOMWindow::requestIdleCallback(IdleRequestCallback* callback, double timeoutMillis)
+{
+    if (Document* doc = document())

[esprehn, 2015/08/21 08:22:21]

you can actually use the variable name document, you need to write
this->document() (the this-> is important) to call the function. that's why I
wrote:

if (Document* document = this->document())
  ...

[rmcilroy, 2015/08/21 11:21:52]

Ahh of course, thanks. Done.

+        return doc->requestIdleCallback(callback, timeoutMillis);
+    return 0;
+}
+
+void LocalDOMWindow::cancelIdleCallback(int id)
+{
+    if (Document* doc = document())
+        doc->cancelIdleCallback(id);
 }
 
 bool LocalDOMWindow::addEventListener(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener> prpListener, bool useCapture)