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This CL addresses a few issues with MCVD unittests:

 - Some tests were marked 'VP8' when they were supposed to be 'not
   VP8'.  This changes them to H264.  Not exactly the same thing,
   but better than it was.
 - Some tests were marked 'H264' since they didn't work for VPx
   for no clear reason.  These have been fixed.
 - VP8 codec could leak, since the drain during destruction wasn't
   complete.  It now completes the drain when needed.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Id9dab9b93425581fa3f7892ef734fbd3e5c54eaf
Reviewed-on: https://chromium-review.googlesource.com/1234360
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592509}