aura: Fix a couple of issues related to held touch events.

ui/aura/root_window.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_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 323 matching lines @@
   Window* mouse_pressed_handler_;
   Window* mouse_moved_handler_;
   Window* event_dispatch_target_;
   Window* old_dispatch_target_;
 
   bool synthesize_mouse_move_;
 
   // How many move holds are outstanding. We try to defer dispatching
   // touch/mouse moves while the count is > 0.
   int move_hold_count_;
+  // The location of |held_move_event_| is in |window_|'s coordinate.
   scoped_ptr<ui::LocatedEvent> held_move_event_;
 
   // Allowing for reposting of events. Used when exiting context menus.
   scoped_ptr<ui::LocatedEvent>  held_repostable_event_;
 
   // Set when dispatching a held event.
   bool dispatching_held_event_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   // Used to schedule reposting an event.
   base::WeakPtrFactory<RootWindow> repost_event_factory_;
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<RootWindow> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_