code: public void setMimeTypes(com.google.api.ads.admanager.axis.v201902.AssetCreativeTemplateVariableMimeType[] mimeTypes) {
          this.mimeTypes = mimeTypes;
      }
docs: Sets the mimeTypes value for this AssetCreativeTemplateVariable.
  
  @param mimeTypes   * A set of supported mime types. This set can be empty or null
  if there's no
  constraint, meaning files of any mime types are
  allowed.