Add setAll, insertAll, replaceRange and fillRange.

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

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 02ff65f2d26a5e681854247e510eaa53b06cf213..9fd0d99f02cfe61d643dd011965e9336bfe2cbbe 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -171,6 +171,14 @@ class _ChildrenElementList extends ListBase<Element> {
     throw new UnimplementedError();
   }
 
+  void replaceRange(int start, int end, Iterable<Element> iterable) {
+    throw new UnimplementedError();
+  }
+
+  void fillRange(int start, int end, [Element fillValue]) {
+    throw new UnimplementedError();
+  }
+
   void remove(Object object) {
     if (object is Element) {
       Element element = object;
@@ -221,6 +229,14 @@ class _ChildrenElementList extends ListBase<Element> {
     }
   }
 
+  void insertAll(int index, Iterable<Element> iterable) {
+    throw new UnimplementedError();
+  }
+
+  void setAll(int index, Iterable<Element> iterable) {
+    throw new UnimplementedError();
+  }
+
   void clear() {
     // It is unclear if we want to keep non element nodes?
     _element.text = '';