Add serialization/deserialization for FakePictureLayer for testing.

cc/blimp/layer_factory.h

 // 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.
 
 #ifndef CC_BLIMP_LAYER_FACTORY_H_
 #define CC_BLIMP_LAYER_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/input/scrollbar.h"
 
 namespace cc {
 class ContentLayerClient;
 class Layer;
 class PictureLayer;
 class SolidColorScrollbarLayer;
 
 // Used to allow tests to inject the Layer created by the
 // CompositorStateDeserializer on the client.
 class LayerFactory {
  public:
   virtual ~LayerFactory() {}
 
   virtual scoped_refptr<Layer> CreateLayer(int engine_layer_id) = 0;
 
   virtual scoped_refptr<PictureLayer> CreatePictureLayer(
       int engine_layer_id,
       ContentLayerClient* content_layer_client) = 0;
 
+  virtual scoped_refptr<PictureLayer> CreateFakePictureLayer(
+      int engine_layer_id,
+      ContentLayerClient* content_layer_client) = 0;
+
   virtual scoped_refptr<SolidColorScrollbarLayer>
   CreateSolidColorScrollbarLayer(int engine_layer_id,
                                  ScrollbarOrientation orientation,
                                  int thumb_thickness,
                                  int track_start,
                                  bool is_left_side_vertical_scrollbar,
                                  int scroll_layer_id) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_BLIMP_LAYER_FACTORY_H_