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

ash/wm/toplevel_window_event_handler.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 "ash/wm/toplevel_window_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/window_resizer.h"
@@ skipping 223 matching lines @@
     }
     default:
       return ui::ER_UNHANDLED;
   }
 
   return ui::ER_CONSUMED;
 }
 
 aura::client::WindowMoveResult ToplevelWindowEventHandler::RunMoveLoop(
     aura::Window* source,
-    const gfx::Point& drag_offset) {
+    const gfx::Vector2d& drag_offset) {
   DCHECK(!in_move_loop_);  // Can only handle one nested loop at a time.
   in_move_loop_ = true;
   move_cancelled_ = false;
   aura::RootWindow* root_window = source->GetRootWindow();
   DCHECK(root_window);
   gfx::Point drag_location;
   if (aura::Env::GetInstance()->is_touch_down()) {
     in_gesture_resize_ = true;
     bool has_point = root_window->gesture_recognizer()->
         GetLastTouchPointForTarget(source, &drag_location);
@@ skipping 178 matching lines @@
 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
   // We explicitly don't invoke RevertDrag() since that may do things to window.
   // Instead we destroy the resizer.
   window_resizer_.reset();
 
   // End the move loop. This does nothing if we're not in a move loop.
   EndMoveLoop();
 }
 
 }  // namespace ash