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

ui/events/ozone/evdev/event_converter_evdev.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 <errno.h>
 #include <linux/input.h>
 #include <stddef.h>
 
 #include "ui/events/ozone/evdev/event_converter_evdev.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/trace_event/trace_event.h"
+#include "ui/events/base_event_utils.h"
 #include "ui/events/devices/device_util_linux.h"
 #include "ui/events/devices/input_device.h"
 
 namespace ui {
 
 EventConverterEvdev::EventConverterEvdev(int fd,
                                          const base::FilePath& path,
                                          int id,
                                          InputDeviceType type,
                                          const std::string& name,
@@ skipping 111 matching lines @@
     Stop();
   } else if (written != sizeof(events)) {
     LOG(ERROR) << "short write setting leds for " << path_.value();
     Stop();
   }
 }
 
 void EventConverterEvdev::SetTouchEventLoggingEnabled(bool enabled) {
 }
 
-base::TimeDelta EventConverterEvdev::TimeDeltaFromInputEvent(
+base::TimeTicks EventConverterEvdev::TimeTicksFromInputEvent(
     const input_event& event) {
-  return base::TimeDelta::FromMicroseconds(
-      static_cast<int64_t>(event.time.tv_sec) * 1000000L + event.time.tv_usec);
+  return ui::EventTimeStampFromSeconds(event.time.tv_sec) +

[miu, 2016/05/16 20:05:35]

Same thing here: How will you ensure this does not break if the implementation
in base/time/time_posix.cc changes?

[majidvp, 2016/05/21 01:38:00]

Added a validation check. If we find out that it gets triggered then we can work
on a fallback. 

[majidvp, 2016/05/24 21:01:38]

After chatting with sadrul@, I decided to add this validation in a separate CL
as it
is rather independent of this change.

I have created:  https://codereview.chromium.org/2007083002/

[miu, 2016/05/25 01:42:31]

Acknowledged. Looks good.

+      base::TimeDelta::FromMicroseconds(event.time.tv_usec);
 }
 }  // namespace ui