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 cc3f3065687c5a0124970b678301de9cecce50ba..215feb8230bcf7d991999488fa0cf6398fa11d62 100644
--- a/Source/core/animation/AnimationPlayer.cpp
+++ b/Source/core/animation/AnimationPlayer.cpp
@@ -39,7 +39,11 @@
 #include "core/frame/UseCounter.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
+#include "platform/RuntimeEnabledFeatures.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 {
@@ -88,26 +92,34 @@ AnimationPlayer::AnimationPlayer(ExecutionContext* executionContext, AnimationTi
     , m_compositorState(nullptr)
     , m_compositorPending(false)
     , m_compositorGroup(0)
+    , m_attachCompositorPlayerToElement(false)
     , m_currentTimePending(false)
     , m_stateIsBeingUpdated(false)
 {
+    createCompositorPlayer();
+
     if (m_content) {
         if (m_content->player()) {
             m_content->player()->cancel();
             m_content->player()->setSource(0);
         }
         m_content->attach(this);
+        attachElementToPlayer();
     }
 }
 
 AnimationPlayer::~AnimationPlayer()
 {
 #if !ENABLE(OILPAN)
-    if (m_content)
+    if (m_content) {
+        detachElementFromPlayer();
         m_content->detach();
+    }
     if (m_timeline)
         m_timeline->playerDestroyed(this);
 #endif
+
+    destroyCompositorPlayer();
 }
 
 double AnimationPlayer::sourceEnd() const
@@ -433,8 +445,10 @@ void AnimationPlayer::setSource(AnimationNode* newSource)
     PlayStateUpdateScope updateScope(*this, TimingUpdateOnDemand, SetCompositorPendingWithSourceChanged);
 
     double storedCurrentTime = currentTimeInternal();
-    if (m_content)
+    if (m_content) {
+        detachElementFromPlayer();
         m_content->detach();
+    }
     m_content = newSource;
     if (newSource) {
         // FIXME: This logic needs to be updated once groups are implemented
@@ -443,6 +457,7 @@ void AnimationPlayer::setSource(AnimationNode* newSource)
             newSource->player()->setSource(0);
         }
         newSource->attach(this);
+        attachElementToPlayer();
         setOutdated();
     }
     setCurrentTimeInternal(storedCurrentTime, TimingUpdateOnDemand);
@@ -830,6 +845,52 @@ void AnimationPlayer::endUpdatingState()
     m_stateIsBeingUpdated = false;
 }
 
+void AnimationPlayer::createCompositorPlayer()
+{
+    if (RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled() && Platform::current()->compositorSupport()) {
+        m_compositorPlayer = adoptPtr(Platform::current()->compositorSupport()->createAnimationPlayer());
+        ASSERT(m_compositorPlayer);
+        m_compositorPlayer->setAnimationDelegate(this);
+    }
+}
+
+void AnimationPlayer::destroyCompositorPlayer()
+{
+    if (m_compositorPlayer)
+        m_compositorPlayer->setAnimationDelegate(nullptr);
+    m_compositorPlayer.clear();
+}
+
+void AnimationPlayer::attachElementToPlayer()
+{
+    m_attachCompositorPlayerToElement = true;
+    updateCompositorPlayerToElementAttachment();
+}
+
+void AnimationPlayer::detachElementFromPlayer()
+{
+    m_attachCompositorPlayerToElement = false;
+    if (m_compositorPlayer && m_compositorPlayer->isLayerAttached())
+        m_compositorPlayer->detachLayer();
+}
+
+void AnimationPlayer::updateCompositorPlayerToElementAttachment()
+{
+    if (!RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled() || !m_attachCompositorPlayerToElement)
+        return;
+    if (!m_compositorPlayer || !m_content || !m_content->isAnimation() || !toAnimation(m_content.get())->canAttachElementToCompositorPlayer())
+        return;
+
+    m_attachCompositorPlayerToElement = false;
+    toAnimation(m_content.get())->attachElementToCompositorPlayer();
+}
+
+void AnimationPlayer::notifyAnimationStarted(double monotonicTime, int group)
+{
+    ASSERT(RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled());
+    timeline()->document()->compositorPendingAnimations().notifyCompositorAnimationStarted(monotonicTime, group);
+}
+
 AnimationPlayer::PlayStateUpdateScope::PlayStateUpdateScope(AnimationPlayer& player, TimingUpdateReason reason, CompositorPendingChange compositorPendingChange)
     : m_player(player)
     , m_initialPlayState(m_player->playStateInternal())