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 f18cc7d8cf3952aaeab7152d10290a11ae22f8cd..fd03bf53cad5acbd6c55051f310ab4ae6a39fac9 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -92,6 +92,7 @@
 #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"
@@ -591,6 +592,8 @@ void Document::dispose()
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
@@ -2147,6 +2150,8 @@ void Document::detach(const AttachContext& context)
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
@@ -5241,6 +5246,26 @@ void Document::serviceScriptedAnimations(double monotonicAnimationStartTime)
     m_scriptedAnimationController->serviceScriptedAnimations(monotonicAnimationStartTime);
 }
 
+ScriptedIdleTaskController& Document::ensureScriptedIdleTaskController()
+{
+    if (!m_scriptedIdleTaskController) {

[jochen (gone - plz use gerrit), 2015/07/31 09:19:19]

no { }

[rmcilroy, 2015/08/11 16:30:51]

Done.

+        m_scriptedIdleTaskController = ScriptedIdleTaskController::create(this, loader()->timing());
+    }
+    return *m_scriptedIdleTaskController;
+}
+
+int Document::requestIdleCallback(IdleRequestCallback* callback, double timeout)
+{
+    return ensureScriptedIdleTaskController().registerCallback(callback, timeout);
+}
+
+void Document::cancelIdleCallback(int id)
+{
+    if (!m_scriptedIdleTaskController)
+        return;

[jochen (gone - plz use gerrit), 2015/07/31 09:19:19]

that should be unreachable, no?

[rmcilroy, 2015/08/11 16:30:51]

If the page calls cancelIdleCallback (with a random int) but hasn't yet called
requestIdleCallback then we could reach this without having a
m_scriptedIdleTaskController. I copied the pattern from cancelAnimationFrame
above.

+    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
@@ -5769,6 +5794,7 @@ 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);