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This cl creates a mojo service for assistant audio decoder. The decoder
is running in utility process. This is a temporary solution until
MediaService for Chrome OS is implemented.

Bug: b/80315134
Test: manual tested can create the audio decoder for assistant.
Change-Id: Ib4d1a8d3e6d38b0cbb436e20e6d12033d74ed7cf
Reviewed-on: https://chromium-review.googlesource.com/1137020Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577713}