autotest: implement hardware_VideoDecodeCapable for freon

BUG=chromium:413125
TEST=hardware_VideoDecodeCapable/control.vaapi

Change-Id: I2eac1365739c17ea054fa4c562b0a7e199d95b22
Reviewed-on: https://chromium-review.googlesource.com/234877
Tested-by: Haixia Shi <hshi@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Haixia Shi <hshi@chromium.org>
Trybot-Ready: Haixia Shi <hshi@chromium.org>
4 files changed