update custom elements and shadow dom

tools/dom/src/dart2js_CustomElementSupport.dart

Index: tools/dom/src/dart2js_CustomElementSupport.dart
diff --git a/tools/dom/src/dart2js_CustomElementSupport.dart b/tools/dom/src/dart2js_CustomElementSupport.dart
index 665cd5e26e61f0529f0948a28241932b37325d68..b6221907be44bc2f7d480e2f2cb6f769854e458d 100644
--- a/tools/dom/src/dart2js_CustomElementSupport.dart
+++ b/tools/dom/src/dart2js_CustomElementSupport.dart
@@ -55,7 +55,7 @@ void _registerCustomElement(context, document, String tag, Type type,
   //          }
   //        }
   //    });
-  //    document.register('x-foo', { prototype: proto });
+  //    document.registerElement('x-foo', { prototype: proto });
   //    ...
   //    var e = document.createElement('x-foo');
 
@@ -99,9 +99,9 @@ void _registerCustomElement(context, document, String tag, Type type,
   JS('void', '#.createdCallback = #', properties,
       JS('=Object', '{value: #}',
           _makeCallbackMethod(_callConstructor(constructor, interceptor))));
-  JS('void', '#.enteredViewCallback = #', properties,
+  JS('void', '#.attachedCallback = #', properties,
       JS('=Object', '{value: #}', _makeCallbackMethod(_callEnteredView)));
-  JS('void', '#.leftViewCallback = #', properties,
+  JS('void', '#.detachedCallback = #', properties,
       JS('=Object', '{value: #}', _makeCallbackMethod(_callLeftView)));
   JS('void', '#.attributeChangedCallback = #', properties,
       JS('=Object', '{value: #}', _makeCallbackMethod3(_callAttributeChanged)));
@@ -117,7 +117,7 @@ void _registerCustomElement(context, document, String tag, Type type,
     JS('=Object', '#.extends = #', options, extendsTagName);
   }
 
-  JS('void', '#.register(#, #)', document, tag, options);
+  JS('void', '#.registerElement(#, #)', document, tag, options);
 }
 
 //// Called by Element.created to do validation & initialization.