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This CL changes the logic used to disable frame validation when running the
video_decode_accelerator_tests binary. Currently when '--disable_validator' is
specified the frame validator will be disabled and the thumbnail test will be
run.

This CL changes this logic to automatically switch to the thumnail test when
support for import mode is not detected. The '--disable_validator' parameter is
now used to both disable the video frame validator (on platforms supporting
import mode) and the thumbnail test (on platforms only supporting allocate
mode).

TEST=./video_decode_accelerator_tests on nyan_big

BUG=None

Change-Id: Ia79acd8557ad102ac6ab4c97a5d1502818a14a83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1688493
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676238}