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

ui/views/widget/desktop_root_window_host.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_WIDGET_DESKTOP_ROOT_WINDOW_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_H_
 
 #include "ui/base/ui_base_types.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
@@ skipping 64 matching lines @@
 
   virtual void SetAlwaysOnTop(bool always_on_top) = 0;
 
   virtual InputMethod* CreateInputMethod() = 0;
   virtual internal::InputMethodDelegate* GetInputMethodDelegate() = 0;
 
   virtual void SetWindowTitle(const string16& title) = 0;
 
   virtual void ClearNativeFocus() = 0;
 
-  virtual Widget::MoveLoopResult RunMoveLoop(const gfx::Point& drag_offset) = 0;
+  virtual Widget::MoveLoopResult RunMoveLoop(
+      const gfx::Vector2d& drag_offset) = 0;
   virtual void EndMoveLoop() = 0;
 
   virtual void SetVisibilityChangedAnimationsEnabled(bool value) = 0;
 
   virtual bool ShouldUseNativeFrame() = 0;
   virtual void FrameTypeChanged() = 0;
   virtual NonClientFrameView* CreateNonClientFrameView() = 0;
 
   virtual void SetFullscreen(bool fullscreen) = 0;
   virtual bool IsFullscreen() const = 0;
@@ skipping 13 matching lines @@
 
   // Called when the DesktopNativeWidgetAura's aura::Window is focused and
   // blurred.
   virtual void OnNativeWidgetFocus() = 0;
   virtual void OnNativeWidgetBlur() = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_ROOT_WINDOW_HOST_H_