[remote-playback] Add "connecting" to the RemotePlaybackState enum

avayvod has just created a new issue for 
https://github.com/w3c/remote-playback:

== Add "connecting" to the RemotePlaybackState enum ==
Represents the state between the time when a remote playback device 
has been picked by the user and when the playback of the media is 
ready to start on the device.

The justifications:
- to be consistent with the sibling Presentation API
- the state allows the website to show some interstitial UI for the 
state transitioning between ```disconnected``` to ```connected```

The draft summary of state changes:
- the initial state is ```disconnected```
- once start() is resolved, the state changes to ```connecting```; 
while in this state all media commands on the video element (play, 
pause, seek, volume, etc) throw exceptions
- if the remote playback is ready to start on the remote device, the 
state changes to ```connected```
- if the remote playback fails to initialize, the state changes to 
```disconnected```

Please view or discuss this issue at 
https://github.com/w3c/remote-playback/issues/3 using your GitHub 
account

Received on Thursday, 14 January 2016 17:40:46 UTC