Revert "Revert "Start of dartium custom element lifecycle event support.""

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 333d747169094cd902e7e68bf34ccc424bfdf0a9..8991ee140adbac41c3e9300cdc05b3dc95839f99 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -6,7 +6,7 @@ part of html;
 
 class _ConsoleVariables {
   Map<String, Object> _data = new Map<String, Object>();
-  
+
   /**
    * Forward member accesses to the backing JavaScript object.
    */
@@ -22,7 +22,7 @@ class _ConsoleVariables {
       return Function.apply(_data[member], invocation.positionalArguments, invocation.namedArguments);
     }
   }
-  
+
   void clear() => _data.clear();
 
   /**
@@ -93,6 +93,17 @@ class _Utils {
     return new UnsupportedError('[info: $fileName:$lineNo]');
   }
 
+  static bool isTypeSubclassOf(Type type, Type other) {
+    if (type == other) {
+      return true;
+    }
+    var superclass = reflectClass(type).superclass;
+    if (superclass != null) {
+      return isTypeSubclassOf(superclass.reflectedType, other);
+    }
+    return false;
+  }
+
   static window() native "Utils_window";
   static forwardingPrint(String message) native "Utils_forwardingPrint";
   static void spawnDomFunction(Function f, int replyTo) native "Utils_spawnDomFunction";
@@ -161,13 +172,13 @@ class _Utils {
       sb.write("final $arg");
       args[arg] = value;
     }
-    
+
     addArg("\$var", _consoleTempVariables);
-    
+
     for (int i = 0; i < locals.length; i+= 2) {
       addArg(locals[i], locals[i+1]);
     }
-    sb..write(')=>\n$expression'); 
+    sb..write(')=>\n$expression');
     return [sb.toString(), args.values.toList(growable: false)];
   }
 
@@ -184,10 +195,10 @@ class _Utils {
    * prepended to disambuguate. This scheme is simplistic but easy to encode and
    * decode. The use case for this method is displaying all map keys in a human
    * readable way in debugging tools.
-   */ 
+   */
   static List<String> getEncodedMapKeyList(dynamic obj) {
     if (obj is! Map) return null;
-    
+
     var ret = new List<String>();
     int i = 0;
     return obj.keys.map((key) {
@@ -271,40 +282,20 @@ class _Utils {
     return libName.startsWith('dart:');
   }
 
-  static void register(String tag, Type type) {
+  static void register(Document document, String tag, Type type,
+      String extendsTagName) {
     // TODO(vsm): Move these checks into native code.
-    if (type == null) {
-      throw new UnsupportedError("Invalid null type.");
-    }
     ClassMirror cls = reflectClass(type);
     if (_isBuiltinType(cls)) {
       throw new UnsupportedError("Invalid custom element from $libName.");
     }
-    ClassMirror superClass = cls.superclass;
-
-    Symbol objectName = reflectClass(Object).qualifiedName;
-    bool isRoot(ClassMirror cls) =>
-      cls == null || cls.qualifiedName == objectName;
-    // TODO(vsm): Support extending SvgElement as well.
-    Symbol elementName = reflectClass(HtmlElement).qualifiedName;
-    bool isElement(ClassMirror cls) =>
-      cls != null && cls.qualifiedName == elementName;
-
-    ClassMirror nativeClass = _isBuiltinType(superClass) ? superClass : null;
-    while(!isRoot(superClass) && !isElement(superClass)) {
-      superClass = superClass.superclass;
-      if (nativeClass == null && _isBuiltinType(superClass)) {
-        nativeClass = superClass;
-      }
-    }
-
-    if (isRoot(superClass)) {
-      throw new UnsupportedError("Invalid custom element doesn't inherit from HtmlElement.");
-    }
-    _register(tag, type, nativeClass.reflectedType);
+    _register(document, tag, type, extendsTagName);
   }
 
-  static void _register(String tag, Type customType, Type nativeType) native "Utils_register";
+  static void _register(Document document, String tag, Type customType,
+      String extendsTagName) native "Utils_register";
+
+  static Element createElement(Document document, String tagName) native "Utils_createElement";
 }
 
 class _NPObject extends NativeFieldWrapperClass1 {