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This CL moves the video test helper code from media/gpu/test/video_player to
media/gpu/test. This will allow us to reuse the code in the video encoder and
other tests. A similar change has already been done for the image test helper
code.

TEST=./video_decode_accelerator_tests on hana

BUG=1045825

Change-Id: I5184042b14154e4d290563346e5d45d690286c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026848Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738084}