Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/core/animation/Animation.cpp

Index: Source/core/animation/Animation.cpp
diff --git a/Source/core/animation/Animation.cpp b/Source/core/animation/Animation.cpp
index 23297a040c5752e4c47c38bbd8c2802d4cce067d..bff59ec64c18f7061f01f17e242f7381318c026b 100644
--- a/Source/core/animation/Animation.cpp
+++ b/Source/core/animation/Animation.cpp
@@ -275,7 +275,7 @@ bool Animation::cancelAnimationOnCompositor()
     if (!m_target || !m_target->layoutObject())
         return false;
     for (const auto& compositorAnimationId : m_compositorAnimationIds)
-        CompositorAnimations::instance()->cancelAnimationOnCompositor(*m_target, compositorAnimationId);
+        CompositorAnimations::instance()->cancelAnimationOnCompositor(*m_target, player(), compositorAnimationId);
     m_compositorAnimationIds.clear();
     return true;
 }
@@ -298,7 +298,7 @@ void Animation::pauseAnimationForTestingOnCompositor(double pauseTime)
     if (!m_target || !m_target->layoutObject())
         return;
     for (const auto& compositorAnimationId : m_compositorAnimationIds)
-        CompositorAnimations::instance()->pauseAnimationForTestingOnCompositor(*m_target, compositorAnimationId, pauseTime);
+        CompositorAnimations::instance()->pauseAnimationForTestingOnCompositor(*m_target, player(), compositorAnimationId, pauseTime);
 }
 
 DEFINE_TRACE(Animation)