cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/layers/layer.h

 // 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.
 
 #ifndef CC_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 373 matching lines @@
   // called only on layers that have changed properties. The properties
   // themselves are pushed to proto::LayerProperties.
   void ToLayerPropertiesProto(proto::LayerUpdate* layer_update);
 
   // Read all property values from the given LayerProperties object and update
   // the current layer. The values for |needs_push_properties_| and
   // |num_dependents_need_push_properties_| are always updated, but the rest
   // of |proto| is only read if |needs_push_properties_| is set.
   void FromLayerPropertiesProto(const proto::LayerProperties& proto);
 
-  // TODO(xingliu): Layer will hold LayerTree instead of LayerTreeHost.
-  // http://crbug.com/628683
   LayerTreeHost* layer_tree_host() { return layer_tree_host_; }
   const LayerTreeHost* layer_tree_host() const { return layer_tree_host_; }
   LayerTree* GetLayerTree() const;
 
   virtual ScrollbarLayerInterface* ToScrollbarLayer();
 
   virtual sk_sp<SkPicture> GetPicture() const;
 
   // Constructs a LayerImpl of the correct runtime type for this Layer type.
   virtual std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl);
@@ skipping 324 matching lines @@
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_