Allow the cursor to warp even when a window is dragged

ash/wm/default_window_resizer.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 ASH_WM_DEFAULT_WINDOW_RESIZER_H_
 #define ASH_WM_DEFAULT_WINDOW_RESIZER_H_
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 
@@ skipping 14 matching lines @@
 
   // Returns true if the drag will result in changing the window in anyway.
   bool is_resizable() const { return details_.is_resizable; }
 
   bool changed_size() const {
     return !(details_.bounds_change & kBoundsChange_Repositions);
   }
   aura::Window* target_window() const { return details_.window; }
 
   // WindowResizer overides:
-  virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
+  virtual void Drag(const gfx::Point& location_in_screen,

[sky, 2012/08/02 23:28:31]

Making this a screen coordinate is too error prone. Keep it in terms of the
parent like it is now and convert as necessary.

I think it's worth adding a GetRootWindowRelativeToWindow that does the
conversion. Don't put it in Shell though. We should move these sort of
coordinate conversions into a namespace in their own file. GetRootWindowAt and
GetRootWindowMatching should be moved there too. Maybe coordinate_conversions or
something.

[Yusuke Sato, 2012/08/03 01:52:11]

Done.

+                    int event_flags) OVERRIDE;
   virtual void CompleteDrag(int event_flags) OVERRIDE;
   virtual void RevertDrag() OVERRIDE;
 
  private:
   explicit DefaultWindowResizer(const Details& details);
 
   const Details details_;
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultWindowResizer);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_DEFAULT_WINDOW_RESIZER_H_