Add protobuf serialization to DisplayItemList

cc/playback/compositing_display_item.h

 // Copyright 2015 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_COMPOSITING_DISPLAY_ITEM_H_
 #define CC_PLAYBACK_COMPOSITING_DISPLAY_ITEM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/playback/display_item.h"
@@ skipping 10 matching lines @@
 class CC_EXPORT CompositingDisplayItem : public DisplayItem {
  public:
   CompositingDisplayItem();
   ~CompositingDisplayItem() override;
 
   void SetNew(uint8_t alpha,
               SkXfermode::Mode xfermode,
               SkRect* bounds,
               skia::RefPtr<SkColorFilter> color_filter);
 
+  void ToProtobuf(proto::DisplayItem* proto) 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;
   void ProcessForBounds(
       DisplayItemListBoundsCalculator* calculator) const override;
 
  private:
   uint8_t alpha_;
   SkXfermode::Mode xfermode_;
   bool has_bounds_;
   SkRect bounds_;
   skia::RefPtr<SkColorFilter> color_filter_;
 };
 
 class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
  public:
   EndCompositingDisplayItem();
   ~EndCompositingDisplayItem() override;
 
   static scoped_ptr<EndCompositingDisplayItem> Create() {
     return make_scoped_ptr(new EndCompositingDisplayItem());
   }
 
+  void ToProtobuf(proto::DisplayItem* proto) 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;
   void ProcessForBounds(
       DisplayItemListBoundsCalculator* calculator) const override;
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_COMPOSITING_DISPLAY_ITEM_H_