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Add utilities to help handle initialization and teardown
of VA objects. Users of VaapiDevice may still manipulate the
VA objects directly with libva calls.

BUG=crbug:1062407

Change-Id: Id5f5233d1476f1abe006f04e3ad54fc6fb9b2486
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296871
Commit-Queue: Jao-ke Chin-Lee <jchinlee@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797848}