问题 I'm developing a casting application to work in Chrome, using the Queuing feature, and need to know how to obtain any callbacks when the next or previous item in the queue is loaded, because the remote player callbacks don't emit after the second video in the queue loads. Google's documentation for the Cast framework is terrible, and I've searched throughout the API and haven't found anything. Here are excerpts from my code (Typescript), specifically, a singleton class: private _context: cast