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This is a reland of aa57fe6d

Original change's description:
> [Media Router] Converts integration tests to run on Chromium waterfall.
>
> This updates the Media Router integration tests so they run in the
> Chromium waterfall with the open source Media Router component
> extension and its mock (test) Media Route Provider.
>
> Additional changes:
>
> - Removes extension from top level BUILD.gn as it is only used for
>   browser tests at the moment.
> - Splits the targets for Media Router browser tests into integration tests
>   (part of main browser_tests suite), e2e tests (which require the
>   external component extension), perf tests, and shared support code.
> - Renames the "test" extension to the "telemetry" extension used for perf
>   tests to avoid confusion.
> - Updates README files
> - One test is not compatible with the Chromium component and need
>   to be fixed.  Bugs 818767 filed for follow-up.
>
> Bug: 698796
> Change-Id: I6cc9302ffd72de95630ce33ca3617b3b73b9e722
> Reviewed-on: https://chromium-review.googlesource.com/917214
> Commit-Queue: mark a. foltz <mfoltz@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Derek Cheng <imcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543005}

TBR=cliffordcheng, imcheng, jrw, sky

Bug: 698796,822029, 821717
Change-Id: Ie5c2fdc9a838dec2906a73f7827fa6ceafdcce1b
Reviewed-on: https://chromium-review.googlesource.com/963064
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543242}