compositor-worker: Initialize CW machinery plumbing to compositor and fire CW rAF callbacks.

cc/trees/layer_tree_host.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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1264 matching lines @@
   proxy_->SetAuthoritativeVSyncInterval(interval);
 }
 
 void LayerTreeHost::RecordFrameTimingEvents(
     std::unique_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
     std::unique_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) {
   client_->RecordFrameTimingEvents(std::move(composite_events),
                                    std::move(main_frame_events));
 }
 
+void LayerTreeHost::SetLayerTreeMutator(
+    std::unique_ptr<LayerTreeMutator> mutator) {
+  proxy_->SetMutator(std::move(mutator));
+}
+
 Layer* LayerTreeHost::LayerById(int id) const {
   LayerIdMap::const_iterator iter = layer_id_map_.find(id);
   return iter != layer_id_map_.end() ? iter->second : NULL;
 }
 
 void LayerTreeHost::AddLayerShouldPushProperties(Layer* layer) {
   layers_that_should_push_properties_.insert(layer);
 }
 
 void LayerTreeHost::RemoveLayerShouldPushProperties(Layer* layer) {
@@ skipping 354 matching lines @@
       [seq_num](Layer* layer) {
         layer->set_property_tree_sequence_number(seq_num);
       },
       CallFunctionLayerType::ALL_LAYERS);
 
   surface_id_namespace_ = proto.surface_id_namespace();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc