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This CL adds a new file vaapi_video_decode_accelerator_unittest
and adds it to media_unittests when use_vaapi is true. The new
file is then compiled as part of the top level chromiumos_preflight
group (in particular by chromeos_amd64-generic_chromium_compile_only_ng),
and also in the linux_chromium_chromeos_ bots.

This CL also adds a few test cases, dealing mostly with the interaction
of input buffers and the VaVDA's internal |decoder_|. (More tests
to come).

Note that: vaapi_..._unittest needs vaapi to be compiled but not
to be run.

Bug: 717265
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I4b8768e79401170269190292ebf18ef616adb1f8
Reviewed-on: https://chromium-review.googlesource.com/753756
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515477}