Initial implementation of WorkletAnimation

third_party/WebKit/Source/core/animation/CompositorAnimations.cpp

Index: third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
index 5b12b63607fab7bc84d775a6792a7d0ab32147c7..13ba4c9371902222dd40b78d7df92e89eb72df64 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
@@ -436,12 +436,14 @@ void CompositorAnimations::StartAnimationOnCompositor(
     double start_time,
     double time_offset,
     const Timing& timing,
-    const Animation& animation,
+    const Animation* animation,
+    CompositorAnimationPlayer* compositor_player,
     const EffectModel& effect,
     Vector<int>& started_animation_ids,
     double animation_playback_rate) {
+  DCHECK(compositor_player);
   DCHECK(started_animation_ids.IsEmpty());
-  DCHECK(CheckCanStartAnimationOnCompositor(timing, element, &animation, effect,
+  DCHECK(CheckCanStartAnimationOnCompositor(timing, element, animation, effect,
                                             animation_playback_rate)
              .Ok());
 
@@ -455,8 +457,6 @@ void CompositorAnimations::StartAnimationOnCompositor(
   DCHECK(!animations.IsEmpty());
   for (auto& compositor_animation : animations) {
     int id = compositor_animation->Id();
-    CompositorAnimationPlayer* compositor_player = animation.CompositorPlayer();
-    DCHECK(compositor_player);
     compositor_player->AddAnimation(std::move(compositor_animation));
     started_animation_ids.push_back(id);
   }