FrozenFrameOnTouchDetector frame timestamp

[pyricau]

Currently FrozenFrameOnTouchDetector listens to ACTION_DOWN events and schedules a frame callback from there, combined with a post at front of queue, and logs a "frozen frame" if the time from down being issued to the end time is greater than 700. This seems wrong as we're scheduling for another frame instead of relying on "end of current frame" as frame end. We probably don't want to rely on frame metrics here, we just want to know how long things were blocked for. A post at front (not async) from event handling should be enough.