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This CL setup a sandboxed utility service for mirroring. The service encodes the
captured audio/video streams and sends them to the remote Cast receiver. The
sandbox type is set to "renderer" since the service does media encoding and
cast control messages parsing, which has similar requirements as a renderer in
term of sandbox policy.

Bug: 734672
Change-Id: Ieeb1e373241266c15535f6d4d8fa54337ca59941
Reviewed-on: https://chromium-review.googlesource.com/1162932Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584186}