Revert 20127

tools/dom/templates/html/impl/impl_MutationObserver.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
   /**
    * Checks to see if the mutation observer API is supported on the current
    * platform.
    */
   static bool get supported {
 $if DARTIUM
     return true;
 $else
     return JS('bool',
         '!!(window.MutationObserver || window.WebKitMutationObserver)');
 $endif
   }
 
   void observe(Node target,
-               {bool childList,
+               {Map options,
+                bool childList,
                 bool attributes,
                 bool characterData,
                 bool subtree,
                 bool attributeOldValue,
                 bool characterDataOldValue,
                 List<String> attributeFilter}) {
 
     // Parse options into map of known type.
     var parsedOptions = _createDict();
 
+    if (options != null) {
+      options.forEach((k, v) {
+          if (_boolKeys.containsKey(k)) {
+            _add(parsedOptions, k, true == v);
+          } else if (k == 'attributeFilter') {
+            _add(parsedOptions, k, _fixupList(v));
+          } else {
+            throw new ArgumentError(
+                "Illegal MutationObserver.observe option '$k'");
+          }
+        });
+    }
+
     // Override options passed in the map with named optional arguments.
     override(key, value) {
       if (value != null) _add(parsedOptions, key, value);
     }
 
     override('childList', childList);
     override('attributes', attributes);
     override('characterData', characterData);
     override('subtree', subtree);
     override('attributeOldValue', attributeOldValue);
@@ skipping 37 matching lines @@
     // Dummy statement to mark types as instantiated.
     JS('MutationObserver|MutationRecord', '0');
 
     return JS('MutationObserver',
         'new(window.MutationObserver||window.WebKitMutationObserver||'
         'window.MozMutationObserver)(#)',
         convertDartClosureToJS(callback, 2));
   }
 $endif
 }