Add dropped frame percent metric to video_PlaybackPerf

Currently video_PlaybackPerf has only dropped frame count metric. The
test plays a video for 30 seconds. The number of decoded and dropped
frames may vary in each run. Also, the dropped frame will change when
we change a test video. To have a more stable metric, add dropped
frame percent to video_PlaybackPerf.

TEST=run the test on a veyron jerry

Change-Id: I729fd356feadbf6f0c142ddc22f046fe8250413a
(cherry picked from commit 4db6632e2476c6c480950ebb871553ab989421a4)
Reviewed-by: Wu-cheng Li <>
Commit-Queue: Wu-cheng Li <>
Tested-by: Wu-cheng Li <>
1 file changed