message: TFS#891662 - allow apps to run tests that pose as frontends
  in nodejs.
diff: /*---------------------------------------------------------------------------------------------
  | $Copyright: (c) 2018 Bentley Systems, Incorporated. All rights reserved. $
  *--------------------------------------------------------------------------------------------*/
  +if (typeof (WebGLRenderingContext) === "undefined") {
  + (global as any).WebGLRenderingContext = new Proxy({}, { get: () => 0 });
  +}
  export namespace GL {
  export enum BlendEquation {
  