This change adds an API in the ForwardingPlayer to disable commands.
This is affecting what Player.isCommandAvailable() returns as
well as what is being advertised from the
EventListener.onAvailableCommandsChanged() callback.
For the callback case, the ForwardingPlayer needs to intercept the
callback. It does so by wrapping registered EventListener and Listener
instances, which resulted in some boiler-plate code. In addition, there
is logic on the wrapped listeners to avoid triggering a queued callback
if all listeners have been removed in the meantime. This includes the
case where new listeners are added while callbacks scheduled for the
removed listeners are still pending.
PiperOrigin-RevId: 371139703
7d2a2aa283