public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
    return TextToSpeechStubSettings.defaultGrpcTransportProviderBuilder();
  }
Returns a builder for the default gRPC ChannelProvider for this service.
java-texttospeech/google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/TextToSpeechSettings.java