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This is a reland of 304c2408

Original change's description:
> [fuchsia] Implement per-app remote debugging in CastRunner.
>
> * Handle the |enable_remote_debugging| parameter in
>   chromium.cast.ApplicationConfig to enable per-app remote debugging
>   in CastRunner.
> * Set the CastRunner debugging port to 9222.
> * Remove a buildflag to enable remote debugging Context-wide.
> * Add a test to check remote debugging is properly enabled per-App.
>
> Bug: 997895
>
> Change-Id: I19aced4e90790e77cc3f55b1118fbf459ae19b14
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773707
> Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
> Reviewed-by: Wez <wez@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702264}

Bug: 997895
Change-Id: Ife9ac25676dbae1866a71cf2445899973f2e9962
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837487Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702508}