Add Vector2d classes that represent offsets, instead of using Point.

content/public/common/common_param_traits.h

 // Copyright (c) 2012 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.
 
 // This file is used to define IPC::ParamTraits<> specializations for a number
 // of types so that they can be serialized over IPC.  IPC::ParamTraits<>
 // specializations for basic types (like int and std::string) and types in the
 // 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
 // specializations for types that are used by the content code, and which need
 // manual serialization code.  This is usually because they're not structs with
@@ skipping 15 matching lines @@
 
 namespace content {
 struct Referrer;
 }
 
 namespace gfx {
 class Point;
 class Rect;
 class RectF;
 class Size;
+class Vector2d;
 }  // namespace gfx
 
 namespace net {
 class HostPortPair;
 }
 
 namespace IPC {
 
 template <>
 struct CONTENT_EXPORT ParamTraits<GURL> {
@@ skipping 29 matching lines @@
 
 template <>
 struct CONTENT_EXPORT ParamTraits<gfx::Size> {
   typedef gfx::Size param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
+struct CONTENT_EXPORT ParamTraits<gfx::Vector2d> {
+  typedef gfx::Vector2d param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
 struct CONTENT_EXPORT ParamTraits<gfx::Rect> {
   typedef gfx::Rect param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct CONTENT_EXPORT ParamTraits<gfx::RectF> {
   typedef gfx::RectF param_type;
@@ skipping 82 matching lines @@
   // Note: This function expects parameter |r| to be of type &SkBitmap since
   // r->SetConfig() and r->SetPixels() are called.
   static bool Read(const Message* m, PickleIterator* iter, param_type* r);
 
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CONTENT_PUBLIC_COMMON_COMMON_PARAM_TRAITS_H_