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

content/common/browser_plugin_messages.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.
 
 // Multiply-included message header, no traditional include guard.
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/process.h"
@@ skipping 208 matching lines @@
   // The scroll offset.  Only one of these can be non-zero, and if they are
   // both zero, then it means there is no scrolling and the scroll_rect is
   // ignored.
   IPC_STRUCT_MEMBER(int, dx)
   IPC_STRUCT_MEMBER(int, dy)
 
   // The rectangular region to scroll.
   IPC_STRUCT_MEMBER(gfx::Rect, scroll_rect)
 
   // The scroll offset of the render view.
-  IPC_STRUCT_MEMBER(gfx::Point, scroll_offset)
+  IPC_STRUCT_MEMBER(gfx::Vector2d, scroll_offset)
 
   // The regions of the bitmap (in view coords) that contain updated pixels.
   // In the case of scrolling, this includes the scroll damage rect.
   IPC_STRUCT_MEMBER(std::vector<gfx::Rect>, copy_rects)
 
   // The size of the RenderView when this message was generated.  This is
   // included so the host knows how large the view is from the perspective of
   // the renderer process.  This is necessary in case a resize operation is in
   // progress. If auto-resize is enabled, this should update the corresponding
   // view size.
@@ skipping 18 matching lines @@
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_ShouldAcceptTouchEvents,
                      int /* instance_id */,
                      bool /* accept */)
 
 // The guest has damage it wants to convey to the embedder so that it can
 // update its backing store.
 IPC_MESSAGE_CONTROL3(BrowserPluginMsg_UpdateRect,
                      int /* instance_id */,
                      int /* message_id */,
                      BrowserPluginMsg_UpdateRect_Params)