Change ui::Event::time_stamp from TimeDelta to TimeTicks

ash/shelf/shelf_view.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_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 371 matching lines @@
   ShelfGestureHandler gesture_handler_;
 
   // True when an item being inserted or removed in the model cancels a drag.
   bool cancelling_drag_model_changed_;
 
   // Index of the last hidden launcher item. If there are no hidden items this
   // will be equal to last_visible_index_ + 1.
   mutable int last_hidden_index_;
 
   // The timestamp of the event which closed the last menu - or 0.
-  base::TimeDelta closing_event_time_;
+  base::TimeTicks closing_event_time_;
 
   // When this object gets deleted while a menu is shown, this pointed
   // element will be set to false.
   bool* got_deleted_;
 
   // True if a drag and drop operation created/pinned the item in the launcher
   // and it needs to be deleted/unpinned again if the operation gets cancelled.
   bool drag_and_drop_item_pinned_;
 
   // The ShelfItem which is currently used for a drag and a drop operation
@@ skipping 45 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_