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The default video can now be overwritten when running a perf test by calling:
./video_decode_accelerator_perf_tests <test_video>.

TEST=ran new VDA perf tests on nocturne

BUG=925714

Change-Id: If095dcb75f70df12852bdc95e2ba45e8dda7b3fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1550179
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648597}