Introduce animation frame tasks

third_party/WebKit/Source/core/dom/ScriptedAnimationController.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 25 matching lines @@
 
 namespace blink {
 
 class Document;
 class Event;
 class EventTarget;
 class FrameRequestCallback;
 class MediaQueryListListener;
 
 class CORE_EXPORT ScriptedAnimationController
-    : public GarbageCollected<ScriptedAnimationController> {
+    : public GarbageCollectedFinalized<ScriptedAnimationController> {
  public:
   static ScriptedAnimationController* create(Document* document) {
     return new ScriptedAnimationController(document);
   }
 
   DECLARE_TRACE();
   void clearDocumentPointer() { m_document = nullptr; }
 
+  // Animation frame callbacks are used for requestAnimationFrame().
   typedef int CallbackId;
+  CallbackId registerCallback(FrameRequestCallback*);
+  void cancelCallback(CallbackId);
 
-  int registerCallback(FrameRequestCallback*);
-  void cancelCallback(CallbackId);
-  void serviceScriptedAnimations(double monotonicTimeNow);
-
+  // Animation frame events are used for resize events, scroll events, etc.
   void enqueueEvent(Event*);
   void enqueuePerFrameEvent(Event*);
+
+  // Animation frame tasks are used for Fullscreen.
+  void enqueueTask(std::unique_ptr<WTF::Closure>);
+
+  // Used for the MediaQueryList change event.
   void enqueueMediaQueryChangeListeners(
       HeapVector<Member<MediaQueryListListener>>&);
 
+  // Invokes callbacks, dispatches events, etc. The order is defined by HTML:
+  // https://html.spec.whatwg.org/multipage/webappapis.html#event-loop-processing-model
+  void serviceScriptedAnimations(double monotonicTimeNow);
+
   void suspend();
   void resume();
 
   void dispatchEventsAndCallbacksForPrinting();
 
  private:
   explicit ScriptedAnimationController(Document*);
 
   void scheduleAnimationIfNeeded();
 
+  void runTasks();
   void dispatchEvents(
       const AtomicString& eventInterfaceFilter = AtomicString());
   void executeCallbacks(double monotonicTimeNow);
   void callMediaQueryListListeners();
 
   bool hasScheduledItems() const;
 
   Member<Document> m_document;
   FrameRequestCallbackCollection m_callbackCollection;
   int m_suspendCount;
+  Vector<std::unique_ptr<WTF::Closure>> m_taskQueue;
   HeapVector<Member<Event>> m_eventQueue;
   HeapListHashSet<std::pair<Member<const EventTarget>, const StringImpl*>>
       m_perFrameEvents;
   using MediaQueryListListeners =
       HeapListHashSet<Member<MediaQueryListListener>>;
   MediaQueryListListeners m_mediaQueryListListeners;
 };
 
 }  // namespace blink
 
 #endif  // ScriptedAnimationController_h