Stops observing for sinks and issues.

Starts observing for sinks that can be used for tab mirroring, and if set, sinks compatible with |presentationUrl| as well.

Sets a sink to be used when the web page requests the browser to choose a sink via Presentation API, Remote Playback API, or Cast SDK.

Starts mirroring the desktop to the sink.

Starts mirroring the tab to the sink.

Stops the active Cast session on the sink.

This is fired whenever the outstanding issue/error message changes.

*/.

This is fired whenever the list of available sinks changes.