refactor(render): use render layer fully

Introduces angular2/src/core/compiler/ViewFactory which
extracts ProtoView.instantiate and replaces ViewPool.

Note: This is a work in progress commit to unblock other commits.
There will be follow ups to add unit tests, remove TODOs, …

modules/angular2/src/render/dom/compiler/compiler.js

@@ -1,10 +1,14 @@
+import {Injectable} from 'angular2/di';
+
 import {PromiseWrapper, Promise} from 'angular2/src/facade/async';
 import {BaseException} from 'angular2/src/facade/lang';
 
 import {Template, ProtoView} from '../../api';
 import {CompilePipeline} from './compile_pipeline';
 import {TemplateLoader} from 'angular2/src/render/dom/compiler/template_loader';
-import {CompileStepFactory} from './compile_step_factory';
+import {CompileStepFactory, DefaultStepFactory} from './compile_step_factory';
+import {Parser} from 'angular2/change_detection';
+import {ShadowDomStrategy} from '../shadow_dom/shadow_dom_strategy';
 
 /**
  * The compiler loads and translates the html templates of components into
@@ -43,4 +47,11 @@ export class Compiler {
       return PromiseWrapper.resolve(protoView);
     }
   }
+}
+
+@Injectable()
+export class DefaultCompiler extends Compiler {
+  constructor(parser:Parser, shadowDomStrategy:ShadowDomStrategy, templateLoader: TemplateLoader) {
+    super(new DefaultStepFactory(parser, shadowDomStrategy), templateLoader);
+  }
 }