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Currently the video_decode_accelerator_tests return '0' if the test failed to
even start because of missing video files or wrong parameters. This CL changes
the return value so the tests will be properly marked as 'failed' in these
cases.

TEST=ran new VDA (perf) tests on nocturne

BUG=879065

Change-Id: Ibd7fae645872c02415ee5a8dadf2cd082eb36939
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1551735
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649717}