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CastRunner now supports a pseudo app-Id, "fuchsia.web.FrameHost", which
creates a meta-component that publishes the fuchsia.web.FrameHost API.

Requests made through this API are routed to the CastRunner's "main"
web.Context, allowing it to be shared with selected peer components on
the system.

Bug: b/170476111, 1120914, 1144102
Change-Id: I34d8cfbd22ed8bdf975f2a36d0bde0d508bba92b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476216
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822590}