Add protobuf serialization to DisplayItemList

cc/playback/transform_display_item.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_PLAYBACK_TRANSFORM_DISPLAY_ITEM_H_
 #define CC_PLAYBACK_TRANSFORM_DISPLAY_ITEM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/playback/display_item.h"
 #include "ui/gfx/transform.h"
 
 class SkCanvas;
 
 namespace cc {
 
 class CC_EXPORT TransformDisplayItem : public DisplayItem {
  public:
   TransformDisplayItem();
   ~TransformDisplayItem() override;
 
   void SetNew(const gfx::Transform& transform);
 
+  void ToProtobuf(proto::DisplayItem* proto) const override;
+  void FromProtobuf(const proto::DisplayItem& proto) override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               SkPicture::AbortCallback* callback) const override;
   void AsValueInto(base::trace_event::TracedValue* array) const override;
 
  private:
   gfx::Transform transform_;
 };
 
 class CC_EXPORT EndTransformDisplayItem : public DisplayItem {
  public:
   EndTransformDisplayItem();
   ~EndTransformDisplayItem() override;
 
   static scoped_ptr<EndTransformDisplayItem> Create() {
     return make_scoped_ptr(new EndTransformDisplayItem());
   }
 
+  void ToProtobuf(proto::DisplayItem* proto) const override;
+  void FromProtobuf(const proto::DisplayItem& proto) override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               SkPicture::AbortCallback* callback) const override;
   void AsValueInto(base::trace_event::TracedValue* array) const override;
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_TRANSFORM_DISPLAY_ITEM_H_