ozone: evdev: Add a couple more trace events

Add trace event inside each read notification for evdev.

BUG=none
TEST=chrome://tracing in link_freon

Review URL: https://codereview.chromium.org/1110693003

Cr-Commit-Position: refs/heads/master@{#327110}
void EventReaderLibevdevCros::OnSynReport(void* data,
                                          EventStateRec* evstate,
                                          struct timeval* tv) {
  EventReaderLibevdevCros* reader = static_cast<EventReaderLibevdevCros*>(data);
  if (reader->ignore_events_)
    return;

  reader->delegate_->OnLibEvdevCrosEvent(&reader->evdev_, evstate, *tv);
}

void EventReaderLibevdevCros::OnSynReport(void* data,
                                          EventStateRec* evstate,
                                          struct timeval* tv) {
  EventReaderLibevdevCros* reader = static_cast<EventReaderLibevdevCros*>(data);
  if (reader->ignore_events_)
    return;

  reader->delegate_->OnLibEvdevCrosEvent(&reader->evdev_, evstate, *tv);
}
