Here I was just using a hard-coded app ID for an app that I had already uploaded to the chrome web store. What we really need here is a way to programmatically get the app ID (specifically, we need the app ID that is associated with the key in the manifest), but I understand that on android we don't actually generate an ID that is associated with the manifest key and instead use a hard-coded gibberish ID, so I'm not sure how we can get the correct app ID.