Replacing SurfaceReferenceBase and SequenceSurfaceReference with Closures

cc/layers/surface_layer.h

 // Copyright 2014 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_SURFACE_LAYER_H_
 #define CC_LAYERS_SURFACE_LAYER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
-#include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_info.h"
-#include "cc/surfaces/surface_reference_base.h"
 #include "cc/surfaces/surface_reference_factory.h"
-#include "cc/surfaces/surface_sequence.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 
 // A layer that renders a surface referencing the output of another compositor
 // instance or client.
 class CC_EXPORT SurfaceLayer : public Layer {
  public:
   static scoped_refptr<SurfaceLayer> Create(
       scoped_refptr<SurfaceReferenceFactory> ref_factory);
@@ skipping 17 matching lines @@
  protected:
   explicit SurfaceLayer(scoped_refptr<SurfaceReferenceFactory> ref_factory);
   bool HasDrawableContent() const override;
 
  private:
   ~SurfaceLayer() override;
   void RemoveCurrentReference();
 
   SurfaceInfo surface_info_;
   scoped_refptr<SurfaceReferenceFactory> ref_factory_;
-  std::unique_ptr<SurfaceReferenceBase> current_ref_;
+  base::Closure reference_returner_;
   bool stretch_content_to_fill_bounds_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SURFACE_LAYER_H_