private void ensureRecognitionResultIsMutable() {
      if (!((bitField0_ & 0x00008000) != 0)) {
        recognitionResult_ =
            new java.util.ArrayList<com.google.cloud.vision.v1p4beta1.FaceRecognitionResult>(
                recognitionResult_);
        bitField0_ |= 0x00008000;
      }
    }
<pre>
Headwear likelihood.
</pre>

<code>.google.cloud.vision.v1p4beta1.Likelihood headwear_likelihood = 15;</code>

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/FaceAnnotation.java