CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/layers/layer.cc

 // Copyright 2010 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 "cc/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/location.h"
@@ skipping 99 matching lines @@
   if (replica_layer_.get()) {
     DCHECK_EQ(this, replica_layer_->parent());
     replica_layer_->RemoveFromParent();
   }
 }
 
 void Layer::SetLayerTreeHost(LayerTreeHost* host) {
   if (layer_tree_host_ == host)
     return;
 
+  if (layer_tree_host_) {
+    layer_tree_host_->property_trees()->needs_rebuild = true;
+    layer_tree_host_->UnregisterLayer(this);
+  }
+  layer_tree_host_ = host;
   if (layer_tree_host_)
-    layer_tree_host_->property_trees()->needs_rebuild = true;
-
-  layer_tree_host_ = host;
+    layer_tree_host_->RegisterLayer(this);
 
   // When changing hosts, the layer needs to commit its properties to the impl
   // side for the new host.
   SetNeedsPushProperties();
 
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->SetLayerTreeHost(host);
 
   if (mask_layer_.get())
     mask_layer_->SetLayerTreeHost(host);
@@ skipping 1345 matching lines @@
 
 void Layer::DidBeginTracing() {
   // We'll be dumping layer trees as part of trace, so make sure
   // PushPropertiesTo() propagates layer debug info to the impl
   // side -- otherwise this won't happen for the the layers that
   // remain unchanged since tracing started.
   SetNeedsPushProperties();
 }
 
 }  // namespace cc