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* Move the existing Cast Streaming browser test into a separate file.
* Add more Cast Streaming browser tests.

Bug: 1042501
Change-Id: I34752670b58a8b54b3eccdf6fb17f9d7f2c5c11c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2194790Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772353}