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

ui/views/widget/native_widget_aura.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_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/activation_delegate.h"
@@ skipping 104 matching lines @@
   virtual void RunShellDrag(View* view,
                             const ui::OSExchangeData& data,
                             const gfx::Point& location,
                             int operation) OVERRIDE;
   virtual void SchedulePaintInRect(const gfx::Rect& rect) OVERRIDE;
   virtual void SetCursor(gfx::NativeCursor cursor) OVERRIDE;
   virtual void ClearNativeFocus() OVERRIDE;
   virtual gfx::Rect GetWorkAreaBoundsInScreen() const OVERRIDE;
   virtual void SetInactiveRenderingDisabled(bool value) OVERRIDE;
   virtual Widget::MoveLoopResult RunMoveLoop(
-      const gfx::Point& drag_offset) OVERRIDE;
+      const gfx::Vector2d& drag_offset) OVERRIDE;
   virtual void EndMoveLoop() OVERRIDE;
   virtual void SetVisibilityChangedAnimationsEnabled(bool value) OVERRIDE;
 
   // Overridden from views::InputMethodDelegate:
   virtual void DispatchKeyEventPostIME(const ui::KeyEvent& key) OVERRIDE;
 
   // Overridden from aura::WindowDelegate:
   virtual gfx::Size GetMinimumSize() const OVERRIDE;
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) OVERRIDE;
@@ skipping 72 matching lines @@
 
   scoped_ptr<DropHelper> drop_helper_;
   int last_drop_operation_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_