cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/trees/layer_tree.cc

 // Copyright 2016 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.h"
 
 #include "base/auto_reset.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_host.h"
 #include "cc/input/page_scale_animation.h"
@@ skipping 702 matching lines @@
 
 LayerListReverseIterator<Layer> LayerTree::rend() {
   return LayerListReverseIterator<Layer>(nullptr);
 }
 
 void LayerTree::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
+SwapPromiseManager* LayerTree::GetSwapPromiseManager() const {
+  return layer_tree_host_->GetSwapPromiseManager();
+}
+
+SurfaceSequenceGenerator* LayerTree::GetSurfaceSequenceGenerator() const {
+  return layer_tree_host_->GetSurfaceSequenceGenerator();
+}
+
 }  // namespace cc