fix(component factory): Only create a single ShadowDomComponentFactory

Author: jbdeboer

lib/core_dom/module_internal.dart

@@ -67,7 +67,7 @@ class CoreDomModule extends Module {
     bind(Compiler, toImplementation: TaggingCompiler);
     bind(CompilerConfig);
 
-    bind(ComponentFactory, toImplementation: ShadowDomComponentFactory);
+    bind(ComponentFactory, toFactory: (i) => i.getByKey(SHADOW_DOM_COMPONENT_FACTORY_KEY));
     bind(ShadowDomComponentFactory);
     bind(TranscludingComponentFactory);
     bind(Content);

lib/core_dom/static_keys.dart

@@ -23,6 +23,7 @@ Key NG_ELEMENT_KEY = new Key(NgElement);
 Key NODE_ATTRS_KEY = new Key(NodeAttrs);
 Key NODE_KEY = new Key(dom.Node);
 Key NODE_TREE_SANITIZER_KEY = new Key(dom.NodeTreeSanitizer);
+Key SHADOW_DOM_COMPONENT_FACTORY_KEY = new Key(ShadowDomComponentFactory);
 Key SHADOW_ROOT_KEY = new Key(dom.ShadowRoot);
 Key TEMPLATE_CACHE_KEY = new Key(TemplateCache);
 Key TEMPLATE_LOADER_KEY = new Key(TemplateLoader);