We should fix the graying out issue and think of alternative options for communicating that a state change is in process.

Amy: How should we indicate that a device is disconnecting? Maybe change the status text to "Disconnecting..." [1] and/or grey out the stop button?

[1] Right now the status text is set to "Connecting..." when connecting

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef

commit ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef
Author: Takumi Fujimoto <takumif@chromium.org>
Date: Mon Nov 12 19:14:24 2018

[Harmony Cast Dialog] Change status text/icon for various sink states

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/1325070
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607297}
[modify] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/app/media_router_strings.grdp
[add] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/app/media_router_strings_grdp/IDS_MEDIA_ROUTER_SINK_DISCONNECTING.png.sha1
[add] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/app/media_router_strings_grdp/IDS_MEDIA_ROUTER_SOURCE_NOT_SUPPORTED.png.sha1
[modify] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/browser/ui/views/media_router/cast_dialog_sink_button.cc
[modify] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/browser/ui/views/media_router/cast_dialog_sink_button.h
[modify] https://crrev.com/ce7ecc9b3a1d9bdf6fb5115554a642eed6f174ef/chrome/browser/ui/views/media_router/cast_dialog_sink_button_unittest.cc