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

ui/views/widget/native_widget_private.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_NATIVE_WIDGET_PRIVATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 
 #include "base/string16.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 192 matching lines @@
   virtual bool IsAccessibleWidget() const = 0;
   virtual void RunShellDrag(View* view,
                             const ui::OSExchangeData& data,
                             const gfx::Point& location,
                             int operation) = 0;
   virtual void SchedulePaintInRect(const gfx::Rect& rect) = 0;
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
   virtual void ClearNativeFocus() = 0;
   virtual gfx::Rect GetWorkAreaBoundsInScreen() const = 0;
   virtual void SetInactiveRenderingDisabled(bool value) = 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;
 
   // Overridden from NativeWidget:
   virtual internal::NativeWidgetPrivate* AsNativeWidgetPrivate() OVERRIDE;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_