avtest_label_detect: detect VAAPI VP9 decode acceleration

BUG=chromium:534975
TEST=run avtest_label_detect on supported and not-supported machines

Change-Id: I987cd5615334a452e1dbf8456a0715bb0d1a19a5
Reviewed-on: https://chromium-review.googlesource.com/306963
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
1 file changed