Extend V4L2 stateful decoder drm-test to support H264 bitstreams.

BUG=b:191804616
TEST=Tested against pantheon H.264 vectors.

Change-Id: I8ba264e1cb0d587e4b15eb63a3e92ef4916e240e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/drm-tests/+/3278712
Reviewed-by: Nathan Hebert <nhebert@chromium.org>
Tested-by: Justin Green <greenjustin@google.com>
Reviewed-by: Miguel Casas-Sanchez <mcasas@chromium.org>
Reviewed-by: Miguel Casas <mcasas@google.com>
Commit-Queue: Justin Green <greenjustin@google.com>
6 files changed