Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/animation/AnimationTimeline.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #include "config.h"
 #include "core/animation/AnimationTimeline.h"
 
 #include "core/animation/AnimationClock.h"
 #include "core/animation/ElementAnimations.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/page/Page.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebCompositorAnimationTimeline.h"
+#include "public/platform/WebCompositorSupport.h"
 
 namespace blink {
 
 namespace {
 
 bool compareAnimationPlayers(const RefPtrWillBeMember<blink::AnimationPlayer>& left, const RefPtrWillBeMember<blink::AnimationPlayer>& right)
 {
     return AnimationPlayer::hasLowerPriority(left.get(), right.get());
 }
 
@@ skipping 14 matching lines @@
     , m_zeroTime(0) // 0 is used by unit tests which cannot initialize from the loader
     , m_zeroTimeInitialized(false)
     , m_playbackRate(1)
     , m_lastCurrentTimeInternal(0)
 {
     if (!timing)
         m_timing = adoptPtrWillBeNoop(new AnimationTimelineTiming(this));
     else
         m_timing = timing;
 
+    if (Platform::current()->compositorSupport() && RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled())
+        m_compositorTimeline = adoptPtr(Platform::current()->compositorSupport()->createAnimationTimeline());
+
     ASSERT(document);
 }
 
 AnimationTimeline::~AnimationTimeline()
 {
 #if !ENABLE(OILPAN)
     for (const auto& player : m_players)
         player->timelineDestroyed();
 #endif
 }
@@ skipping 227 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_document);
     visitor->trace(m_timing);
     visitor->trace(m_playersNeedingUpdate);
     visitor->trace(m_players);
 #endif
 }
 
 } // namespace