UI Compositor Animation: Remove cc::ElementAnimations state storage.

ui/compositor/layer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 205 matching lines @@
       return true;
   }
   return false;
 }
 
 void Layer::SetAnimator(LayerAnimator* animator) {
   Compositor* compositor = GetCompositor();
 
   if (animator_) {
     if (compositor)
-      animator_->ResetCompositor(compositor);
+      animator_->DetachLayerAndTimeline(compositor);
     animator_->SetDelegate(nullptr);
   }
 
   animator_ = animator;
 
   if (animator_) {
     animator_->SetDelegate(this);
     if (compositor)
-      animator_->SetCompositor(compositor);
+      animator_->AttachLayerAndTimeline(compositor);
   }
 }
 
 LayerAnimator* Layer::GetAnimator() {
   if (!animator_.get())
     SetAnimator(LayerAnimator::CreateDefaultAnimator());
   return animator_.get();
 }
 
 void Layer::SetTransform(const gfx::Transform& transform) {
@@ skipping 803 matching lines @@
                          subpixel_position_offset_);
 }
 
 void Layer::SetCompositorForAnimatorsInTree(Compositor* compositor) {
   DCHECK(compositor);
   LayerAnimatorCollection* collection = compositor->layer_animator_collection();
 
   if (animator_) {
     if (animator_->is_animating())
       animator_->AddToCollection(collection);
-    animator_->SetCompositor(compositor);
+    animator_->AttachLayerAndTimeline(compositor);
   }
 
   for (auto* child : children_)
     child->SetCompositorForAnimatorsInTree(compositor);
 }
 
 void Layer::ResetCompositorForAnimatorsInTree(Compositor* compositor) {
   DCHECK(compositor);
   LayerAnimatorCollection* collection = compositor->layer_animator_collection();
 
   if (animator_) {
-    animator_->ResetCompositor(compositor);
+    animator_->DetachLayerAndTimeline(compositor);
     animator_->RemoveFromCollection(collection);
   }
 
   for (auto* child : children_)
     child->ResetCompositorForAnimatorsInTree(compositor);
 }
 
 }  // namespace ui