message: add exp
diff: @@ -8,6 +8,7 @@ import {
  IDocumentService,
  IDocumentServiceFactory,
  IResolvedUrl,
  + IExperimentalDocumentServiceFactory,
  } from "@microsoft/fluid-driver-definitions";
  import { ISummaryTree } from "@microsoft/fluid-protocol-definitions";
  import { IOdspResolvedUrl } from "./contracts";
  @@ -22,7 +23,10 @@ import { OdspDocumentService } from "./odspDocumentService";
  * This constructor should be used by environments that support dynamic imports and that wish
  * to leverage code splitting as a means to keep bundles as small as possible.
  */
  -export class OdspDocumentServiceFactoryWithCodeSplit implements IDocumentServiceFactory {
  +export class OdspDocumentServiceFactoryWithCodeSplit implements IDocumentServiceFactory,
  + IExperimentalDocumentServiceFactory
  +{
  + public readonly isExperimentalDocumentServiceFactory = true;
  public readonly protocolName = "fluid-odsp:";
  private readonly documentsOpened = new Set<string>();
  