Add optional arguments to our indexOf/lastIndexOf methods.

client/html/src/DocumentFragmentWrappingImplementation.dart

Index: client/html/src/DocumentFragmentWrappingImplementation.dart
===================================================================
--- client/html/src/DocumentFragmentWrappingImplementation.dart	(revision 942)
+++ client/html/src/DocumentFragmentWrappingImplementation.dart	(working copy)
@@ -99,10 +99,14 @@
   Iterator<Element> iterator() => _filtered.iterator();
   List<Element> getRange(int start, int length) =>
     _filtered.getRange(start, length);
-  int indexOf(Element element, int startIndex) =>
-    _filtered.indexOf(element, startIndex);
-  int lastIndexOf(Element element, int startIndex) =>
-    _filtered.lastIndexOf(element, startIndex);
+  int indexOf(Element element, [int start = 0]) =>
+    _filtered.indexOf(element, start);
+
+  int lastIndexOf(Element element, [int start = null]) {

[srdjan, 2011/10/31 18:01:29]

WHy not just [int start] (here and everywhere else where default value is null)?

[ngeoffray, 2011/11/01 07:50:44]

Last time I checked, not giving a default value failed on DartC.

+    if (start === null) start = length - 1;
+    return _filtered.lastIndexOf(element, start);
+  }
+
   Element last() => _filtered.last();
 }
 
@@ -362,4 +366,4 @@
     throw new UnsupportedOperationException(
       "WebKit drop zone can't be set for document fragments.");
   }
-}
+}