feat(platform-browser-dynamic): export JitCompilerFactory (#20478)

Fixes #20125
PR Close #20478

integration/dynamic-compiler/src/app.component.ts

@@ -0,0 +1,27 @@
+import {AfterViewInit, Compiler, Component, ViewChild, ViewContainerRef} from '@angular/core';
+
+declare var System: any;
+
+@Component({
+  selector: 'app-root',
+  template: `
+    <h1>Hello world!</h1>
+    <div #vc></div>
+  `,
+})
+export class AppComponent implements AfterViewInit {
+  @ViewChild('vc', {read: ViewContainerRef}) container: ViewContainerRef;
+
+  constructor(private compiler: Compiler) {
+  }
+
+  ngAfterViewInit() {
+    System.import('./dist/lazy.bundle.js').then((module: any) => {
+      this.compiler.compileModuleAndAllComponentsAsync(module.LazyModule)
+        .then((compiled) => {
+          const factory = compiled.componentFactories[0];
+          this.container.createComponent(factory);
+        });
+    });
+  }
+}