move polymer.dart into dart svn

pkg/polymer/lib/src/custom_tag_name.dart

Index: pkg/polymer/lib/src/custom_tag_name.dart
diff --git a/pkg/custom_element/lib/src/custom_tag_name.dart b/pkg/polymer/lib/src/custom_tag_name.dart
similarity index 89%
copy from pkg/custom_element/lib/src/custom_tag_name.dart
copy to pkg/polymer/lib/src/custom_tag_name.dart
index 72d915039db8b5d8d046de806898d554a337dfec..637b937dd13ed14068eb42ffd4652598775777e4 100644
--- a/pkg/custom_element/lib/src/custom_tag_name.dart
+++ b/pkg/polymer/lib/src/custom_tag_name.dart
@@ -2,14 +2,14 @@
 // 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.
 
-library custom_element.src.custom_tag_name;
+library polymer.src.custom_tag_name;
 
 /**
  * Returns true if this is a valid custom element name. See:
  * <https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/custom/index.html#dfn-custom-element-name>
  */
 bool isCustomTag(String name) {
-  if (!name.contains('-')) return false;
+  if (name == null || !name.contains('-')) return false;
 
   // These names have meaning in SVG or MathML, so they aren't allowed as custom
   // tags.