code: public com.google.api.ads.admanager.axis.v201811.AdUnitSize[] getCompanions() {
          return companions;
      }
docs: Gets the companions value for this AdUnitSize.
  
  @return companions   * The companions for this ad unit size.
  Companions are only valid if the environment is {@link
  EnvironmentType#VIDEO_PLAYER}.
  If the environment is {@link EnvironmentType#BROWSER}
  including companions
  results in an error.