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Defines the FIDL service which will be provided by the CastAgent to
supply the CastRunner with bindings scripts and receive channels
connected to the scripts.


Bug: 953958
Change-Id: Ie1962e1395975b5daf3e3a0f13140f79676adfde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592854
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657374}