Merge "Send features first and then routes when registering MR2Manager" into sc-dev

        userRecord.mManagerRecords.add(managerRecord);

        mAllManagerRecords.put(binder, managerRecord);

        userRecord.mHandler.sendMessage(obtainMessage(UserHandler::notifyRoutesToManager,

                userRecord.mHandler, manager));

        // Note: Features should be sent first before the routes. If not, the

        // RouteCallback#onRoutesAdded() for system MR2 will never be called with initial routes

        // due to the lack of features.

        for (RouterRecord routerRecord : userRecord.mRouterRecords) {

            // TODO: UserRecord <-> routerRecord, why do they reference each other?

            // How about removing mUserRecord from routerRecord?

                    obtainMessage(UserHandler::notifyPreferredFeaturesChangedToManager,

                        routerRecord.mUserRecord.mHandler, routerRecord, manager));

        }

        userRecord.mHandler.sendMessage(obtainMessage(UserHandler::notifyRoutesToManager,

                userRecord.mHandler, manager));

    }

    private void unregisterManagerLocked(@NonNull IMediaRouter2Manager manager, boolean died) {