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

content/renderer/render_view_impl.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.
 
 #ifndef CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 720 matching lines @@
                         bool is_fullscreen) OVERRIDE;
   virtual void WillInitiatePaint() OVERRIDE;
   virtual void DidInitiatePaint() OVERRIDE;
   virtual void DidFlushPaint() OVERRIDE;
   virtual webkit::ppapi::PluginInstance* GetBitmapForOptimizedPluginPaint(
       const gfx::Rect& paint_bounds,
       TransportDIB** dib,
       gfx::Rect* location,
       gfx::Rect* clip,
       float* scale_factor) OVERRIDE;
-  virtual gfx::Point GetScrollOffset() OVERRIDE;
+  virtual gfx::Vector2d GetScrollOffset() OVERRIDE;
   virtual void DidHandleKeyEvent() OVERRIDE;
   virtual bool WillHandleMouseEvent(
       const WebKit::WebMouseEvent& event) OVERRIDE;
   virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) OVERRIDE;
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) OVERRIDE;
   virtual void OnSetFocus(bool enable) OVERRIDE;
   virtual void OnWasHidden() OVERRIDE;
   virtual void OnWasShown(bool needs_repainting) OVERRIDE;
   virtual bool SupportsAsynchronousSwapBuffers() OVERRIDE;
   virtual bool ForceCompositingModeEnabled() OVERRIDE;
@@ skipping 789 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_