Initial work on ImageData.data.

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

Index: tools/dom/templates/html/impl/impl_ImageData.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_ImageData.darttemplate b/tools/dom/templates/html/impl/impl_ImageData.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..c7e0977bb537c18f02357fedc6c19d2581ee1eb8
--- /dev/null
+++ b/tools/dom/templates/html/impl/impl_ImageData.darttemplate
@@ -0,0 +1,20 @@
+// Copyright (c) 2013, 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 {
+$if DARTIUM
+  List<int> __data;
+
+  List<int> get data {
+    if (__data == null) {
+      __data = _data;
+    }
+    return __data;
+  }
+$endif
+
+$!MEMBERS
+}