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A protected gpu memory buffer is a buffer that can be referred to
by a GpuMemoryBufferHandle, which does not provide access to the buffer's
contents. Such handle can be shared with and received from clients that
should not have access to the buffer's contents. When such handle is
passed to the ProtectedGpuMemoryBufferManager service by its privileged
client, it can be translated into another GpuMemoryBufferHandle, which
allows access to the buffer.

Also, implement a ProtectedMemoryManager to provide an allocation and
lookup service for such buffers for gbm.

Finally, add secure mode API to the ArcVideoAccelerator stack and integrate
it with the above, to provide a secure codec mode implementation.

TEST=E2E video playback tests
BUG=b:27174405,b:62575861,b:27204780

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: I80259db35463f7ed0cc3acc28bf767e55e46c8b8
Reviewed-on: https://chromium-review.googlesource.com/689818Reviewed-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Owen Lin <owenlin@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Pawel Osciak <posciak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512797}