public Builder mergeDeleteTime(com.google.protobuf.Timestamp value) {
      if (deleteTimeBuilder_ == null) {
        if (((bitField0_ & 0x00000100) != 0)
            && deleteTime_ != null
            && deleteTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
          getDeleteTimeBuilder().mergeFrom(value);
        } else {
          deleteTime_ = value;
        }
      } else {
        deleteTimeBuilder_.mergeFrom(value);
      }
      if (deleteTime_ != null) {
        bitField0_ |= 0x00000100;
        onChanged();
      }
      return this;
    }
<pre>
Output only. The time at which this resource was requested for deletion.
This field is not used.
</pre>

<code>
.google.protobuf.Timestamp delete_time = 12 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/PhraseSet.java