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

ui/events/ozone/evdev/event_converter_evdev.cc

Index: ui/events/ozone/evdev/event_converter_evdev.cc
diff --git a/ui/events/ozone/evdev/event_converter_evdev.cc b/ui/events/ozone/evdev/event_converter_evdev.cc
index dcb23ca38347c2b23fc118979d35b30d14045b45..ed4aa9b516f5707b82a8ea28c95e41c6257e8a0b 100644
--- a/ui/events/ozone/evdev/event_converter_evdev.cc
+++ b/ui/events/ozone/evdev/event_converter_evdev.cc
@@ -12,6 +12,7 @@
 #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"
 
@@ -143,9 +144,9 @@ void EventConverterEvdev::SetCapsLockLed(bool enabled) {
 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