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

ui/views/widget/native_widget_aura.cc

 // 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.
 
 #include "ui/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/activation_change_observer.h"
@@ skipping 574 matching lines @@
 void NativeWidgetAura::SetInactiveRenderingDisabled(bool value) {
   if (!value) {
     active_window_observer_.reset();
   } else {
     active_window_observer_.reset(
         new NativeWidgetAuraWindowObserver(window_, delegate_));
   }
 }
 
 Widget::MoveLoopResult NativeWidgetAura::RunMoveLoop(
-    const gfx::Point& drag_offset) {
+    const gfx::Vector2d& drag_offset) {
   if (window_->parent() &&
       aura::client::GetWindowMoveClient(window_->parent())) {
     SetCapture();
     if (aura::client::GetWindowMoveClient(window_->parent())->RunMoveLoop(
             window_, drag_offset) == aura::client::MOVE_SUCCESSFUL) {
       return Widget::MOVE_LOOP_SUCCESSFUL;
     }
   }
   return Widget::MOVE_LOOP_CANCELED;
 }
@@ skipping 384 matching lines @@
   return aura::Env::GetInstance()->is_mouse_button_down();
 }
 
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   return aura::Env::GetInstance()->is_touch_down();
 }
 
 }  // namespace internal
 }  // namespace views