Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/animation/AnimationTimeline.cpp

Index: Source/core/animation/AnimationTimeline.cpp
diff --git a/Source/core/animation/AnimationTimeline.cpp b/Source/core/animation/AnimationTimeline.cpp
index a9d7abfda6e1e39ed1396850c8a7cf600371b5d1..6d50b70c8ef19b9642d25df44b390e1afdd4836b 100644
--- a/Source/core/animation/AnimationTimeline.cpp
+++ b/Source/core/animation/AnimationTimeline.cpp
@@ -37,7 +37,11 @@
 #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 {
 
@@ -72,6 +76,9 @@ AnimationTimeline::AnimationTimeline(Document* document, PassOwnPtrWillBeRawPtr<
     else
         m_timing = timing;
 
+    if (Platform::current()->compositorSupport() && RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled())
+        m_compositorTimeline = adoptPtr(Platform::current()->compositorSupport()->createAnimationTimeline());
+
     ASSERT(document);
 }
 
@@ -159,6 +166,12 @@ void AnimationTimeline::scheduleNextService()
     }
 }
 
+void AnimationTimeline::updateCompositedLayersAttachments()
+{
+    for (AnimationPlayer* player : m_players)

[dstockwell, 2015/03/26 03:04:39]

m_playersNeedingUpdate?

[loyso (OOO), 2015/03/30 02:47:19]

UPDATE: Not applicable anymore.

+        player->updateCompositedLayersAttachment();
+}
+
 void AnimationTimeline::AnimationTimelineTiming::wakeAfter(double duration)
 {
     m_timer.startOneShot(duration, FROM_HERE);