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This flag is needed for the E2E tests to continue functioning as Cast
discovery is moved to the browser side.

The flag name is media-router-cast-device-ips, and the value is a
comma-separated list of IP endpoints of the Cast devices. The port
number can be omitted, and will default to 8009 in that case.

Bug: 698940
Change-Id: I1cf9b4ebc7c63f53ed811002eb917af137e62b74
Reviewed-on: https://chromium-review.googlesource.com/1024237
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553659}