@java.lang.Override
    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
      return super.setUnknownFields(unknownFields);
    }
<pre>
Optional. Optional fields for the role from the corresponding Content.
</pre>

<code>string role = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The bytes for role to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/TokensInfo.java