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

ui/views/win/hwnd_message_handler.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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlmisc.h>
@@ skipping 86 matching lines @@
   void Activate();
   void Deactivate();
 
   void SetAlwaysOnTop(bool on_top);
 
   bool IsVisible() const;
   bool IsActive() const;
   bool IsMinimized() const;
   bool IsMaximized() const;
 
-  bool RunMoveLoop(const gfx::Point& drag_offset);
+  bool RunMoveLoop(const gfx::Vector2d& drag_offset);
   void EndMoveLoop();
 
   // Tells the HWND its client area has changed.
   void SendFrameChanged();
 
   void FlashFrame(bool flash);
 
   void ClearNativeFocus();
 
   void SetCapture();
@@ skipping 342 matching lines @@
   // True if we are allowed to update the layered window from the DIB backing
   // store if necessary.
   bool can_update_layered_window_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_