Implement requestIdleCallback API

Source/core/frame/RemoteDOMWindow.cpp

Index: Source/core/frame/RemoteDOMWindow.cpp
diff --git a/Source/core/frame/RemoteDOMWindow.cpp b/Source/core/frame/RemoteDOMWindow.cpp
index 6286d7cd4d2bbd9767621fe5e7f17a14e0ad2a27..29f8953940faa645e982cf07dc9a7daa591f14d4 100644
--- a/Source/core/frame/RemoteDOMWindow.cpp
+++ b/Source/core/frame/RemoteDOMWindow.cpp
@@ -328,6 +328,17 @@ void RemoteDOMWindow::cancelAnimationFrame(int id)
     ASSERT_NOT_REACHED();
 }
 
+int RemoteDOMWindow::requestIdleCallback(IdleRequestCallback*, double timeoutMillis)
+{
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+void RemoteDOMWindow::cancelIdleCallback(int id)
+{
+    ASSERT_NOT_REACHED();
+}
+
 RemoteDOMWindow::RemoteDOMWindow(RemoteFrame& frame)
     : m_frame(&frame)
 {