Implement requestIdleCallback API

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index be4eee242f3c4bf5fd3e270dea6cac481171ded7..2aff5c201de51a354399b31c0ee3e245a9520ab6 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -91,6 +91,7 @@
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/ScriptRunner.h"
 #include "core/dom/ScriptedAnimationController.h"
+#include "core/dom/ScriptedIdleTaskController.h"
 #include "core/dom/SelectorQuery.h"
 #include "core/dom/StaticNodeList.h"
 #include "core/dom/StyleEngine.h"
@@ -644,6 +645,11 @@ void Document::dispose()
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    // FIXME: consider using ActiveDOMObject.
+    if (m_scriptedIdleTaskController)
+        m_scriptedIdleTaskController->clearDocumentPointer();
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
@@ -2130,6 +2136,11 @@ void Document::detach(const AttachContext& context)
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    // FIXME: consider using ActiveDOMObject.
+    if (m_scriptedIdleTaskController)
+        m_scriptedIdleTaskController->clearDocumentPointer();
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
@@ -5130,6 +5141,26 @@ void Document::serviceScriptedAnimations(double monotonicAnimationStartTime)
     m_scriptedAnimationController->serviceScriptedAnimations(monotonicAnimationStartTime);
 }
 
+ScriptedIdleTaskController& Document::ensureScriptedIdleTaskController()
+{
+    if (!m_scriptedIdleTaskController) {
+        m_scriptedIdleTaskController = ScriptedIdleTaskController::create(this);
+    }
+    return *m_scriptedIdleTaskController;
+}
+
+int Document::requestIdleFrame(IdleRequestCallback* callback)
+{
+    return ensureScriptedIdleTaskController().registerCallback(callback);
+}
+
+void Document::cancelIdleFrame(int id)
+{
+    if (!m_scriptedIdleTaskController)
+        return;
+    m_scriptedIdleTaskController->cancelCallback(id);
+}
+
 PassRefPtrWillBeRawPtr<Touch> Document::createTouch(DOMWindow* window, EventTarget* target, int identifier, double pageX, double pageY, double screenX, double screenY, double radiusX, double radiusY, float rotationAngle, float force) const
 {
     // Match behavior from when these types were integers, and avoid surprises from someone explicitly
@@ -5734,6 +5765,7 @@ DEFINE_TRACE(Document)
     visitor->trace(m_styleSheetList);
     visitor->trace(m_mediaQueryMatcher);
     visitor->trace(m_scriptedAnimationController);
+    visitor->trace(m_scriptedIdleTaskController);
     visitor->trace(m_textAutosizer);
     visitor->trace(m_registrationContext);
     visitor->trace(m_customElementMicrotaskRunQueue);