feat(core): add a component resolver that can load components lazily using system.js

modules/@angular/core/src/linker.ts

@@ -1,5 +1,6 @@
 // Public API for compiler
 export {ComponentResolver} from './linker/component_resolver';
+export {SystemJsComponentResolver} from './linker/systemjs_component_resolver';
 export {QueryList} from './linker/query_list';
 export {DynamicComponentLoader} from './linker/dynamic_component_loader';
 export {ElementRef} from './linker/element_ref';

modules/@angular/core/src/linker/systemjs_component_resolver.ts

@@ -0,0 +1,21 @@
+import { ComponentResolver } from './component_resolver';
+import { Type, isString, global } from '../../src/facade/lang';
+import { ComponentFactory } from './component_factory';
+
+/**
+ * Component resolver that can load components lazily
+ */
+export class SystemJsComponentResolver implements ComponentResolver {
+  constructor(private _resolver: ComponentResolver) {}
+
+  resolveComponent(componentType:string|Type):Promise<ComponentFactory<any>> {
+    if (isString(componentType)) {
+      return (<any>global).System.import(componentType).then(module =>
+        this._resolver.resolveComponent(module.default));
+    } else {
+      return this._resolver.resolveComponent(<Type>componentType);
+    }
+  }
+
+  clearCache() {}
+}