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

ui/base/user_activity/user_activity_detector.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/base/user_activity/user_activity_detector.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "ui/base/user_activity/user_activity_observer.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/platform/platform_event_source.h"
 
 namespace ui {
 
 namespace {
 
 UserActivityDetector* g_instance = nullptr;
 
 // Returns a string describing |event|.
 std::string GetEventDebugString(const ui::Event* event) {
   std::string details = base::StringPrintf(
-      "type=%d name=%s flags=%d time=%" PRId64,
-      event->type(), event->name().c_str(), event->flags(),
-      event->time_stamp().InMilliseconds());
+      "type=%d name=%s flags=%d time=%" PRId64, event->type(),
+      event->name().c_str(), event->flags(),
+      (event->time_stamp() - base::TimeTicks()).InMilliseconds());
 
   if (event->IsKeyEvent()) {
     details += base::StringPrintf(" key_code=%d",
         static_cast<const ui::KeyEvent*>(event)->key_code());
   } else if (event->IsMouseEvent() || event->IsTouchEvent() ||
              event->IsGestureEvent()) {
     details += base::StringPrintf(" location=%s",
         static_cast<const ui::LocatedEvent*>(
             event)->location().ToString().c_str());
   }
@@ skipping 85 matching lines @@
       (now - last_observer_notification_time_).InMillisecondsF() >=
       kNotifyIntervalMs) {
     if (VLOG_IS_ON(1))
       VLOG(1) << "Reporting user activity: " << GetEventDebugString(event);
     FOR_EACH_OBSERVER(UserActivityObserver, observers_, OnUserActivity(event));
     last_observer_notification_time_ = now;
   }
 }
 
 }  // namespace ui