code: public void setEnvironmentType(com.google.api.ads.admanager.axis.v201811.EnvironmentType environmentType) {
          this.environmentType = environmentType;
      }
docs: Sets the environmentType value for this LineItemSummary.
  
  @param environmentType   * The environment that the {@code LineItem} is targeting. The
  default value
  is {@link EnvironmentType#BROWSER}. If this value
  is
  {@link EnvironmentType#VIDEO_PLAYER}, then this line
  item can only target
  {@code AdUnits} that have {@code AdUnitSizes} whose
  {@code environmentType}
  is also {@code VIDEO_PLAYER}.