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The test video player is created to improve the way VDA (video decode
accelerator) tests are created, and to allow more control of the test flow.

This is an early prototype, that only supports playing a video from start to
finish. More complex tests and their required functionality will be added soon.

TEST=ran new VDA tests on eve and kevin

BUG=879065

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: Ida7396e7294c0e367417c352284e4a601daa0cba
Reviewed-on: https://chromium-review.googlesource.com/c/1179484
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609622}