private void ensureTokenIdsIsMutable() {
      if (!tokenIds_.isModifiable()) {
        tokenIds_ = makeMutableCopy(tokenIds_);
      }
      bitField0_ |= 0x00000002;
    }
<pre>
A list of tokens from the input.
</pre>

<code>repeated bytes tokens = 1;</code>

@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/TokensInfo.java