Activate LayerImpl tree with sync+push instead of pointer swap

cc/layer_tree_impl.cc

 // Copyright 2011 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/layer_tree_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/layer_tree_host_common.h"
 #include "cc/layer_tree_host_impl.h"
 #include "ui/gfx/vector2d_conversions.h"
@@ skipping 216 matching lines @@
 void LayerTreeImpl::SetContentsTexturesPurged() {
   contents_textures_purged_ = true;
   layer_tree_host_impl_->OnCanDrawStateChangedForTree(this);
 }
 
 void LayerTreeImpl::ResetContentsTexturesPurged() {
   contents_textures_purged_ = false;
   layer_tree_host_impl_->OnCanDrawStateChangedForTree(this);
 }
 
+Proxy* LayerTreeImpl::proxy() const {
+  return layer_tree_host_impl_->proxy();
+}
+
 const LayerTreeSettings& LayerTreeImpl::settings() const {
   return layer_tree_host_impl_->settings();
 }
 
 OutputSurface* LayerTreeImpl::output_surface() const {
   return layer_tree_host_impl_->outputSurface();
 }
 
 ResourceProvider* LayerTreeImpl::resource_provider() const {
   return layer_tree_host_impl_->resourceProvider();
@@ skipping 12 matching lines @@
 }
 
 bool LayerTreeImpl::IsActiveTree() const {
   return layer_tree_host_impl_->activeTree() == this;
 }
 
 bool LayerTreeImpl::IsPendingTree() const {
   return layer_tree_host_impl_->pendingTree() == this;
 }
 
+bool LayerTreeImpl::IsRecycleTree() const {
+  return layer_tree_host_impl_->recycleTree() == this;
+}
+
 LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
   LayerTreeImpl* tree = layer_tree_host_impl_->activeTree();
   if (!tree)
     return NULL;
   return tree->LayerById(id);
 }
 
 LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
   LayerTreeImpl* tree = layer_tree_host_impl_->pendingTree();
   if (!tree)
@@ skipping 43 matching lines @@
 
 AnimationRegistrar* LayerTreeImpl::animationRegistrar() const {
   return layer_tree_host_impl_->animationRegistrar();
 }
 
 const PinchZoomViewport& LayerTreeImpl::pinch_zoom_viewport() const {
   return layer_tree_host_impl_->pinchZoomViewport();
 }
 
 } // namespace cc