feat(platform-server): add API to render Module and ModuleFactory to string (#14381)

- PlatformState provides an interface to serialize the current Platform State as a string or Document.

- renderModule and renderModuleFactory are convenience methods to wait for Angular Application to stabilize and then render the state to a string.

- refactor code to remove defaultDoc from DomAdapter and inject DOCUMENT where it's needed.

modules/@angular/platform-webworker/src/web_workers/worker/worker_adapter.ts

@@ -55,7 +55,6 @@ export class WorkerDomAdapter extends DomAdapter {
   set attrToPropMap(value: {[key: string]: string}) { throw 'not implemented'; }
 
   parse(templateHtml: string) { throw 'not implemented'; }
-  query(selector: string): any { throw 'not implemented'; }
   querySelector(el: any /** TODO #9100 */, selector: string): HTMLElement {
     throw 'not implemented';
   }
@@ -169,10 +168,9 @@ export class WorkerDomAdapter extends DomAdapter {
   }
   templateAwareRoot(el: any /** TODO #9100 */) { throw 'not implemented'; }
   createHtmlDocument(): HTMLDocument { throw 'not implemented'; }
-  defaultDoc(): HTMLDocument { throw 'not implemented'; }
   getBoundingClientRect(el: any /** TODO #9100 */) { throw 'not implemented'; }
-  getTitle(): string { throw 'not implemented'; }
-  setTitle(newTitle: string) { throw 'not implemented'; }
+  getTitle(doc: Document): string { throw 'not implemented'; }
+  setTitle(doc: Document, newTitle: string) { throw 'not implemented'; }
   elementMatches(n: any /** TODO #9100 */, selector: string): boolean { throw 'not implemented'; }
   isTemplateElement(el: any): boolean { throw 'not implemented'; }
   isTextNode(node: any /** TODO #9100 */): boolean { throw 'not implemented'; }
@@ -189,10 +187,10 @@ export class WorkerDomAdapter extends DomAdapter {
   }
   supportsDOMEvents(): boolean { throw 'not implemented'; }
   supportsNativeShadowDOM(): boolean { throw 'not implemented'; }
-  getGlobalEventTarget(target: string): any { throw 'not implemented'; }
+  getGlobalEventTarget(doc: Document, target: string): any { throw 'not implemented'; }
   getHistory(): History { throw 'not implemented'; }
   getLocation(): Location { throw 'not implemented'; }
-  getBaseHref(): string { throw 'not implemented'; }
+  getBaseHref(doc: Document): string { throw 'not implemented'; }
   resetBaseElement(): void { throw 'not implemented'; }
   getUserAgent(): string { throw 'not implemented'; }
   setData(element: any /** TODO #9100 */, name: string, value: string) { throw 'not implemented'; }

modules/@angular/platform-webworker/src/worker_app.ts

@@ -8,6 +8,7 @@
 
 import {CommonModule} from '@angular/common';
 import {APP_INITIALIZER, ApplicationModule, ErrorHandler, NgModule, NgZone, PlatformRef, Provider, RootRenderer, createPlatformFactory, platformCore} from '@angular/core';
+import {DOCUMENT} from '@angular/platform-browser';
 
 import {BROWSER_SANITIZATION_PROVIDERS} from './private_import_platform-browser';
 import {ON_WEB_WORKER} from './web_workers/shared/api';
@@ -60,7 +61,7 @@ export function setupWebWorker(): void {
  */
 @NgModule({
   providers: [
-    BROWSER_SANITIZATION_PROVIDERS, Serializer,
+    BROWSER_SANITIZATION_PROVIDERS, Serializer, {provide: DOCUMENT, useValue: null},
     {provide: ClientMessageBrokerFactory, useClass: ClientMessageBrokerFactory_},
     {provide: ServiceMessageBrokerFactory, useClass: ServiceMessageBrokerFactory_},
     WebWorkerRootRenderer, {provide: RootRenderer, useExisting: WebWorkerRootRenderer},

modules/@angular/platform-webworker/src/worker_render.ts

@@ -135,7 +135,7 @@ function _exceptionHandler(): ErrorHandler {
 }
 
 function _document(): any {
-  return getDOM().defaultDoc();
+  return document;
 }
 
 function createNgZone(): NgZone {