Merge "blast: ordering layer death and callbacks"

    sp<Layer> layer(client->getLayerUser(s.surface));

    if (layer == nullptr) {

        for (auto& listenerCallback : listenerCallbacks) {

            mTransactionCompletedThread.addUnpresentedCallbackHandle(

                    new CallbackHandle(listenerCallback.transactionCompletedListener,

                                       listenerCallback.callbackIds, s.surface));

        }

        return 0;

    }