Add includeAncestors to dartium matches call.

tools/dom/templates/html/impl/impl_Element.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;
 
 class _ChildrenElementList extends ListBase<Element> {
   // Raw Element.
   final Element _element;
   final HtmlCollection _childElements;
@@ skipping 859 matching lines @@
       case 'afterend':
         this.parentNode.insertBefore(node, this.nextNode);
         break;
       default:
         throw new ArgumentError("Invalid position ${where}");
     }
   }
 
   /**
    * Checks if this element matches the CSS selectors.
+   */
+  @Experimental()
+  bool _matches(String selectors) {
+    if (JS('bool', '!!#.matches', this)) {
+      return JS('bool', '#.matches(#)', this, selectors);
+    } else if (JS('bool', '!!#.webkitMatchesSelector', this)) {
+      return JS('bool', '#.webkitMatchesSelector(#)', this, selectors);
+    } else if (JS('bool', '!!#.mozMatchesSelector', this)) {
+      return JS('bool', '#.mozMatchesSelector(#)', this, selectors);
+    } else if (JS('bool', '!!#.msMatchesSelector', this)) {
+      return matches = JS('bool', '#.msMatchesSelector(#)', this, selectors);
+    } else {
+      throw new UnsupportedError("Not supported on this platform");
+    }
+    return false;
+  }
+$else
+$endif
+
+  /**
+   * Checks if this element matches the CSS selectors.
    *
    * If `includeAncestors` is true, we examine all of this element's parent
    * elements and also return true if any of its parent elements matches
    * `selectors`.
    */
   @Experimental()
   bool matches(String selectors, [includeAncestors = false]) {
     var elem = this;
     do {
-      bool matches = false;
-      if (JS('bool', '!!#.matches', elem)) {
-        matches = JS('bool', '#.matches(#)', elem, selectors);
-      } else if (JS('bool', '!!#.webkitMatchesSelector', elem)) {
-        matches = JS('bool', '#.webkitMatchesSelector(#)', elem, selectors);
-      } else if (JS('bool', '!!#.mozMatchesSelector', elem)) {
-        matches = JS('bool', '#.mozMatchesSelector(#)', elem, selectors);
-      } else if (JS('bool', '!!#.msMatchesSelector', elem)) {
-        matches = JS('bool', '#.msMatchesSelector(#)', elem, selectors);
-      } else {
-        throw new UnsupportedError("Not supported on this platform");
-      }
-      if (matches) return true;
+      if (elem._matches(selectors)) return true;
       elem = elem.parent;
     } while(includeAncestors && elem != null);
     return false;
   }
-$else
-$endif
 
 $if DART2JS
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
 $endif
   Element _templateInstanceRef;
 
   // Note: only used if `this is! TemplateElement`
 $if DART2JS
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
 $endif
@@ skipping 391 matching lines @@
   const ScrollAlignment._internal(this._value);
   toString() => 'ScrollAlignment.$_value';
 
   /// Attempt to align the element to the top of the scrollable area.
   static const TOP = const ScrollAlignment._internal('TOP');
   /// Attempt to center the element in the scrollable area.
   static const CENTER = const ScrollAlignment._internal('CENTER');
   /// Attempt to align the element to the bottom of the scrollable area.
   static const BOTTOM = const ScrollAlignment._internal('BOTTOM');
 }