public Builder setOutputGcsUri(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      outputGcsUri_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Required. Specifies a Cloud Storage URI for the synthesis results. Must be
specified in the format: `gs://bucket_name/object_name`, and the bucket
must already exist.
</pre>

<code>string output_gcs_uri = 4 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The outputGcsUri to set.
@return This builder for chaining.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeLongAudioRequest.java