public com.google.protobuf.FieldMaskOrBuilder getUpdateMaskOrBuilder() {
      if (updateMaskBuilder_ != null) {
        return updateMaskBuilder_.getMessageOrBuilder();
      } else {
        return updateMask_ == null
            ? com.google.protobuf.FieldMask.getDefaultInstance()
            : updateMask_;
      }
    }
<pre>
Required. The update mask which specifies fields which should be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/UpdateSlateRequest.java