Add protobuf serialization to DisplayItemList

cc/proto/gfx_conversions.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_PROTO_GFX_CONVERSIONS_H_
 #define CC_PROTO_GFX_CONVERSIONS_H_
 
 #include "cc/base/cc_export.h"
 
 namespace gfx {
@@ skipping 11 matching lines @@
 namespace proto {
 class Point;
 class PointF;
 class Rect;
 class RectF;
 class Size;
 class SizeF;
 class Transform;
 }
 
+// TODO(dtrainor): Move these to a class and make them static
+// (crbug.com/548432).
 CC_EXPORT void PointToProto(const gfx::Point& point, proto::Point* proto);
 CC_EXPORT gfx::Point ProtoToPoint(const proto::Point& proto);
 
 CC_EXPORT void PointFToProto(const gfx::PointF& point, proto::PointF* proto);
 CC_EXPORT gfx::PointF ProtoToPointF(const proto::PointF& proto);
 
 CC_EXPORT void RectToProto(const gfx::Rect& rect, proto::Rect* proto);
 CC_EXPORT gfx::Rect ProtoToRect(const proto::Rect& proto);
 
 CC_EXPORT void RectFToProto(const gfx::RectF& rect, proto::RectF* proto);
 CC_EXPORT gfx::RectF ProtoToRectF(const proto::RectF& proto);
 
 CC_EXPORT void SizeToProto(const gfx::Size& size, proto::Size* proto);
 CC_EXPORT gfx::Size ProtoToSize(const proto::Size& proto);
 
 CC_EXPORT void SizeFToProto(const gfx::SizeF& size, proto::SizeF* proto);
 CC_EXPORT gfx::SizeF ProtoToSizeF(const proto::SizeF& proto);
 
 CC_EXPORT void TransformToProto(const gfx::Transform& transform,
                                 proto::Transform* proto);
 CC_EXPORT gfx::Transform ProtoToTransform(const proto::Transform& proto);
 
 }  // namespace cc
 
 #endif  // CC_PROTO_GFX_CONVERSIONS_H_