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If a sink is DISCONNECTING, change the icon to a throbber and change the
status text to "Disconnecting...", but don't grey out the title text.

If a sink is AVAILABLE but does not support the selected source, change
the status text to "Source not supported".

The hashes for the screenshots are per the instructions here:
https://docs.google.com/document/d/1nwYWDny20icMSpLUuV_LgrlbWKrYpbXOERUIZNH636o/edit
And the screenshots are uploaded here:
https://storage.googleapis.com/chromium-translation-screenshots/7f85b1d7787495adf8153366ecc39cdd43762144
https://storage.googleapis.com/chromium-translation-screenshots/7f3bb4aeb5b577e98ab1415b31f967311af8747a

Bug: 902493, 899998, 883392
Change-Id: Ib556de3e5407500a63c729c7bd02001572fa91e8
Reviewed-on: https://chromium-review.googlesource.com/c/1325070Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607297}