private void ensurePhrasesIsMutable() {
      if (!phrases_.isModifiable()) {
        phrases_ = new com.google.protobuf.LazyStringArrayList(phrases_);
      }
      bitField0_ |= 0x00000001;
    }
<pre>
Provides "hints" to the speech recognizer to favor specific words and phrases
in the results.
</pre>

Protobuf type {@code google.cloud.videointelligence.v1p3beta1.SpeechContext}
java-video-intelligence/proto-google-cloud-video-intelligence-v1p3beta1/src/main/java/com/google/cloud/videointelligence/v1p3beta1/SpeechContext.java