Add MJPEGvideo_ChromeRTCHWDecodeUsed_y4m HW acceleration test.

Use existing webrtc hw acceleration test to test for mjpeg hw
acceleration.

BUG=chromium:516569
TEST=Ran video_ChromeRTCHWDecodeUsed_y4m(exisiting) and video_ChromeRTCHWDecodeUsed_mjpeg (new)
CQ-DEPEND=CL:295387

Change-Id: I6f9b5c90d6fb9872cbb3e8f5decd62b28448d7af
Reviewed-on: https://chromium-review.googlesource.com/295452
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Commit-Queue: Mussa Kiroga <mussa@chromium.org>
Tested-by: Mussa Kiroga <mussa@chromium.org>
3 files changed