Fix DataView constructor and byte accessors.

lib/dom/templates/html/frog/factoryprovider_DataView.darttemplate

Index: lib/dom/templates/html/frog/factoryprovider_DataView.darttemplate
diff --git a/lib/dom/templates/html/frog/factoryprovider_DataView.darttemplate b/lib/dom/templates/html/frog/factoryprovider_DataView.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..c3d35a79a0cef039df2ff2577971057cb613cf70
--- /dev/null
+++ b/lib/dom/templates/html/frog/factoryprovider_DataView.darttemplate
@@ -0,0 +1,13 @@
+// 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.
+
+class $FACTORYPROVIDER {
+  factory DataView(ArrayBuffer buffer,
+                   [int byteOffset = null, int byteLength = null])

[Anton Muhin, 2012/06/18 10:25:35]

why explicit null defaults?

+      native '''
+          if (byteOffset == null) return new DataView(buffer);

[Anton Muhin, 2012/06/18 10:25:35]

nit: === instead of ==?

+          if (byteLength == null) return new DataView(buffer, byteOffset);
+          return new DataView(buffer, byteOffset, byteLength);
+      ''';
+}