registerIdleTransitionCallback

Registers the given ResourceCallback with the resource. Espresso will call this method:

• with its implementation of ResourceCallback so it can be notified asynchronously that your resource is idle
• from the main thread, but you are free to execute the callback's onTransitionToIdle from any thread
• once (when it is initially given a reference to your IdlingResource)

You only need to call this upon transition from busy to idle - if the resource is already idle when the method is called invoking the call back is optional and has no significant impact.

Parameters