Chromium Blog: Investigating input to output rate

1. Android uses the native C++ MotionEvent timestamp (with nanosecond precision), but Chrome uses Java MotionEvent.getEventTime & MotionEvent.getHistoricalEventTime (milliseconds precision). Unfortunately, nanosecond precision was not part of the public API. However, rounding of milliseconds can introduce error into our predictor when it computes velocity between event timestamps.