Fix display id type in long press affordance handler. Currently, the affordance

ash/wm/gestures/long_press_affordance_handler.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_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
 #define ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
 
 #include "base/timer.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/linear_animation.h"
@@ skipping 50 matching lines @@
   virtual bool ShouldSendCanceledFromStop() OVERRIDE;
 
   // Overridden from ui::AnimationDelegate.
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
 
   class LongPressAffordanceView;
   scoped_ptr<LongPressAffordanceView> view_;
   gfx::Point tap_down_location_;
   int tap_down_touch_id_;
   base::OneShotTimer<LongPressAffordanceHandler> timer_;
-  int tap_down_display_id_;
+  int64 tap_down_display_id_;
   LongPressAnimationType current_animation_type_;
 
   DISALLOW_COPY_AND_ASSIGN(LongPressAffordanceHandler);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_