GitLab

* Add basic start/stop and send/receive tests for the Cast Streaming
  component
* Merge 2 core targets in cast_streaming into one.

Bug: 1110490

Change-Id: Ia949ca73c69badeaaad60adb024b3f4bcb44f40a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553143Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837890}