Revert "Revert "Dart2js support for custom element lifecycle events""

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 2f2259cf9ce82311f99182db49eab18d87e5dcf4..4e97d224d149db9b75e12b1f3f1e3a3061e3ec1c 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -9146,6 +9146,20 @@ abstract class Element extends Node implements ParentNode, ChildNode native "Ele
   @Experimental()
   void created() {}
 
+  /**
+   * Called by the DOM when this element has been inserted into the live
+   * document.
+   */
+  @Experimental()
+  void enteredView() {}
+
+  /**
+   * Called by the DOM when this element has been removed from the live
+   * document.
+   */
+  @Experimental()
+  void leftView() {}
+
   // Hooks to support custom WebComponents.
 
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
@@ -32037,14 +32051,22 @@ _callCreated(receiver) {
   return receiver.created();
 }
 
-_makeCreatedCallbackMethod() {
+_callEnteredView(receiver) {
+  return receiver.enteredView();
+}
+
+_callLeftView(receiver) {
+  return receiver.leftView();
+}
+
+_makeCallbackMethod(callback) {
   return JS('',
       '''((function(invokeCallback) {
              return function() {
                return invokeCallback(this);
              };
           })(#))''',
-      convertDartClosureToJS(_callCreated, 1));
+      convertDartClosureToJS(callback, 1));
 }
 
 const _typeNameToTag = const {
@@ -32106,10 +32128,18 @@ void _registerCustomElement(context, document, String tag, Type type,
 
   var properties = JS('=Object', '{}');
 
-  var jsCreatedCallback = _makeCreatedCallbackMethod();
-
   JS('void', '#.createdCallback = #', properties,
-      JS('=Object', '{value: #}', jsCreatedCallback));
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callCreated)));
+  JS('void', '#.enteredViewCallback = #', properties,
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callEnteredView)));
+  JS('void', '#.leftViewCallback = #', properties,
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callLeftView)));
+
+  // TODO(blois): Bug 13220- remove once transition is complete
+  JS('void', '#.enteredDocumentCallback = #', properties,
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callEnteredView)));
+  JS('void', '#.leftDocumentCallback = #', properties,
+      JS('=Object', '{value: #}', _makeCallbackMethod(_callLeftView)));
 
   var baseProto = JS('=Object', '#.prototype', baseConstructor);
   var proto = JS('=Object', 'Object.create(#, #)', baseProto, properties);