public int getSmallIconId() throws RemoteException {
        return mService.getSmallIconId();
    }
Requests an Android resource id to be used for the notification small icon.
@return An Android resource id for the notification small icon. -1 if non found.
@throws RemoteException If the Service dies while responding to the request.
@throws SecurityException If verification with the TrustedWebActivityService fails.
customtabs/src/android/support/customtabs/trusted/TrustedWebActivityServiceWrapper.java