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This adds support for sending a GPU Mojo interface to the OEMCrypto
daemon so that it can communicate with the GPU to get access to secure
buffers for storing decrypted content. The actual implementation of the
Mojo interface will be done in another CL.

BUG=b:62576736
TEST=E2E test w/ & w/out secure buffers work (used prototype for secure)

Change-Id: Ifb4677e3349530efd5115c0a81249e71cbdb2e2b
Reviewed-on: https://chromium-review.googlesource.com/671412Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#502914}