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

ui/events/gestures/motion_event_aura.cc

 // Copyright 2014 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 "ui/events/gestures/motion_event_aura.h"
 
 #include "base/logging.h"
 #include "ui/events/gesture_detection/gesture_configuration.h"
 
 namespace ui {
@@ skipping 93 matching lines @@
       UpdateTouch(touch);
       break;
     default:
       NOTREACHED();
       return false;
   }
 
   UpdateCachedAction(touch);
   set_unique_event_id(touch.unique_event_id());
   set_flags(touch.flags());
-  set_event_time(touch.time_stamp() + base::TimeTicks());
+  set_event_time(touch.time_stamp());
   return true;
 }
 
 void MotionEventAura::CleanupRemovedTouchPoints(const TouchEvent& event) {
   if (event.type() != ET_TOUCH_RELEASED &&
       event.type() != ET_TOUCH_CANCELLED) {
     return;
   }
 
   DCHECK(GetPointerCount());
@@ skipping 55 matching lines @@
 
 int MotionEventAura::GetIndexFromId(int id) const {
   int index = FindPointerIndexOfId(id);
   // TODO(tdresser): remove these checks once crbug.com/525189 is fixed.
   CHECK_GE(index, 0);
   CHECK_LT(index, static_cast<int>(GetPointerCount()));
   return index;
 }
 
 }  // namespace ui