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This starts with //media/gpu/test:local_gpu_memory_buffer_manager
needing to use the chromeos-specific minigbm library.

Also then add a check for use_vaapi to the vaapi jpeg/webp decoder
unittests.

Change-Id: I3991961746bd6626b772f9143544c238d67b3dde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439780
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813082}