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Implements a component which receives API bindings from the Agent
and injects them into the current Cast application, and connects ports
pushed from the Cast application to the Agent.

Modifies CastComponent to only trigger NamedMessagePortConnector port
injection once a page is fully loaded.

Bug: 953958
Change-Id: I11f7a64bf5b0db4bfd341ea8b6b1ffb03c5b2ffb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601563
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660633}