Merge "Print timestamp (instead of age) in Location#toString()" into jb-mr1-dev

        if (mElapsedRealtimeNano == 0) {

            s.append(" et=?!?");

        } else {

            long age = SystemClock.elapsedRealtimeNano() - mElapsedRealtimeNano;

            s.append(" age=");

            TimeUtils.formatDuration(age / 1000000L, s);

            s.append(" et=");

            TimeUtils.formatDuration(mElapsedRealtimeNano / 1000000L, s);

        }

        if (mHasAltitude) s.append(" alt=").append(mAltitude);

        if (mHasSpeed) s.append(" vel=").append(mSpeed);