Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/animation/AnimationPlayer.cpp

Index: Source/core/animation/AnimationPlayer.cpp
diff --git a/Source/core/animation/AnimationPlayer.cpp b/Source/core/animation/AnimationPlayer.cpp
index c3e08adab9d18a0f513c970c60f6bdd63089227d..98f3976c89cdd0b4b5919bb46dba6ea4d2a12cf3 100644
--- a/Source/core/animation/AnimationPlayer.cpp
+++ b/Source/core/animation/AnimationPlayer.cpp
@@ -40,6 +40,9 @@
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "platform/TraceEvent.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebCompositorAnimationPlayer.h"
+#include "public/platform/WebCompositorSupport.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
@@ -91,6 +94,8 @@ AnimationPlayer::AnimationPlayer(ExecutionContext* executionContext, AnimationTi
     , m_currentTimePending(false)
     , m_stateIsBeingUpdated(false)
 {
+    createCompositorPlayer();

[dstockwell, 2015/02/26 00:07:12]

Why do we always create a compositor player? Seems like a waste of
time/resources.

[loyso (OOO), 2015/02/26 03:24:57]

Because draft. In reality we must know beforehand, whether we need it. (If it
has compositor-compatible animations?)

I will hide it behind runtime flag (maybe, temporary).

+
     if (m_content) {
         if (m_content->player()) {
             m_content->player()->cancel();
@@ -108,6 +113,8 @@ AnimationPlayer::~AnimationPlayer()
     if (m_timeline)
         m_timeline->playerDestroyed(this);
 #endif
+
+    destroyCompositorPlayer();
 }
 
 double AnimationPlayer::sourceEnd() const
@@ -353,6 +360,30 @@ bool AnimationPlayer::affects(const Element& element, CSSPropertyID property) co
     return (animation->target() == &element) && animation->affects(property);
 }
 
+void AnimationPlayer::notifyAnimationStarted(double monotonicTime, int group)
+{
+    timeline()->document()->compositorPendingAnimations().notifyCompositorAnimationStarted(monotonicTime, group);
+}
+
+void AnimationPlayer::notifyAnimationFinished(double monotonicTime, int group)
+{
+}
+
+void AnimationPlayer::createCompositorPlayer()
+{
+    if (Platform::current()->compositorSupport()) {
+        m_compositorPlayer = adoptPtr(Platform::current()->compositorSupport()->createAnimationPlayer());
+        m_compositorPlayer->setAnimationDelegate(this);
+    }
+}
+
+void AnimationPlayer::destroyCompositorPlayer()
+{
+    if (m_compositorPlayer)
+        m_compositorPlayer->setAnimationDelegate(nullptr);
+    m_compositorPlayer.clear();
+}
+
 double AnimationPlayer::calculateStartTime(double currentTime) const
 {
     return m_timeline->effectiveTime() - currentTime / m_playbackRate;