Add protobuf serialization to DisplayItemList

cc/playback/display_item_proto_factory.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_DISPLAY_ITEM_PROTO_FACTORY_H_
+#define CC_PLAYBACK_DISPLAY_ITEM_PROTO_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "cc/playback/display_item.h"
+#include "cc/playback/display_item_list.h"
+
+namespace cc {
+
+namespace proto {
+class DisplayItem;
+}
+
+class DisplayItemProtoFactory {

[vmpstr, 2015/10/26 17:46:17]

I wonder if it's possible to make this patch more similar to how
https://codereview.chromium.org/1398443008/ is.. Something like having a
DisplayItemProtoConverter and have most of the functionality that deals with
general structure of the display item list in there. Wdyt?

+ public:
+  static DisplayItem* AllocateAndConstruct(scoped_refptr<DisplayItemList> list,
+                                           const proto::DisplayItem& proto);
+
+ private:
+  DisplayItemProtoFactory() {}
+  virtual ~DisplayItemProtoFactory() {}
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayItemProtoFactory);
+};
+
+}  // namespace cc
+
+#endif  // CC_PLAYBACK_DISPLAY_ITEM_PROTO_FACTORY_H_