Implement requestIdleCallback API

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 74 matching lines @@
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/NodeFilter.h"
 #include "core/dom/NodeIterator.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/NodeWithIndex.h"
 #include "core/dom/NthIndexCache.h"
 #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"
 #include "core/dom/TouchList.h"
 #include "core/dom/TransformSource.h"
 #include "core/dom/TreeWalker.h"
 #include "core/dom/VisitedLinkState.h"
 #include "core/dom/XMLDocument.h"
 #include "core/dom/custom/CustomElementMicrotaskRunQueue.h"
 #include "core/dom/custom/CustomElementRegistrationContext.h"
@@ skipping 479 matching lines @@
 
     m_markers->clear();
 
     m_cssCanvasElements.clear();
 
     // FIXME: consider using ActiveDOMObject.
     if (m_scriptedAnimationController)
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
     m_lifecycle.advanceTo(DocumentLifecycle::Disposed);
     DocumentLifecycleNotifier::notifyDocumentWasDisposed();
 
     m_canvasFontCache.clear();
 }
 #endif
 
@@ skipping 1536 matching lines @@
     if (m_frame->loader().client()->sharedWorkerRepositoryClient())
         m_frame->loader().client()->sharedWorkerRepositoryClient()->documentDetached(this);
 
     stopActiveDOMObjects();
 
     // FIXME: consider using ActiveDOMObject.
     if (m_scriptedAnimationController)
         m_scriptedAnimationController->clearDocumentPointer();
     m_scriptedAnimationController.clear();
 
+    m_scriptedIdleTaskController.clear();
+
     if (svgExtensions())
         accessSVGExtensions().pauseAnimations();
 
     // FIXME: This shouldn't be needed once LocalDOMWindow becomes ExecutionContext.
     if (m_domWindow)
         m_domWindow->clearEventQueue();
 
     if (m_layoutView)
         m_layoutView->setIsInWindow(false);
 
@@ skipping 3074 matching lines @@
     m_scriptedAnimationController->cancelCallback(id);
 }
 
 void Document::serviceScriptedAnimations(double monotonicAnimationStartTime)
 {
     if (!m_scriptedAnimationController)
         return;
     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
     // passing Infinity/NaN.
     if (!std::isfinite(pageX))
         pageX = 0;
     if (!std::isfinite(pageY))
         pageY = 0;
     if (!std::isfinite(screenX))
         screenX = 0;
@@ skipping 508 matching lines @@
     visitor->trace(m_formController);
     visitor->trace(m_visitedLinkState);
     visitor->trace(m_frame);
     visitor->trace(m_domWindow);
     visitor->trace(m_fetcher);
     visitor->trace(m_parser);
     visitor->trace(m_contextFeatures);
     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);
     visitor->trace(m_elementDataCache);
     visitor->trace(m_associatedFormControls);
     visitor->trace(m_useElementsNeedingUpdate);
     visitor->trace(m_layerUpdateSVGFilterElements);
     visitor->trace(m_timers);
     visitor->trace(m_templateDocument);
     visitor->trace(m_templateDocumentHost);
@@ skipping 19 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif