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This service allows control of webviews and cast apps via gRPC.
Webview functionality will be added in a future change.

Merge-With: eureka-internal/333992

Bug: Internal b/143945774
Bug: Internal b/143307560
Test: Build cast_shell
Change-Id: I05d36a2bd8900afeee3a175c97d773428d482311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907108
Commit-Queue: Shawn Gallea <sagallea@google.com>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714229}