Capture state of the camera device. Whenever the user grants a media-request sent by the web
page, requesting video capture capabilities (
true})) this property will be set to
The application can monitor this property and provide a visual indicator allowing to optionally
deactivate or mute the capture device by setting this property respectively to
If the capture state of the device is set to
WEBKIT_MEDIA_CAPTURE_STATE_NONE the web-page
can still re-request the permission to the user. Permission desision caching is left to the application.