Enables codegen support in polymer

pkg/polymer/lib/src/build/common.dart

Index: pkg/polymer/lib/src/build/common.dart
diff --git a/pkg/polymer/lib/src/build/common.dart b/pkg/polymer/lib/src/build/common.dart
index 2510742a3aeb6f859ead651e16fca4ed6f5eac56..dee92ac7f395700c3bd7c650a9afd3b4f1f9ecc9 100644
--- a/pkg/polymer/lib/src/build/common.dart
+++ b/pkg/polymer/lib/src/build/common.dart
@@ -188,3 +188,23 @@ class _ErrorCollector extends AnalysisErrorListener {
   final errors = <AnalysisError>[];
   onError(error) => errors.add(error);
 }
+
+// These names have meaning in SVG or MathML, so they aren't allowed as custom

[blois, 2014/03/26 16:02:33]

Is this list from somewhere?

[Siggi Cherem (dart-lang), 2014/03/26 17:56:34]

yeah, that's what the link below in [isCustomTagName] was originally pointing
to. Seems that the link was redirected, but the #tag was not preserved. I
updated the link to reflect the latest location.

(FYI this code was just refactored from another file, nothing new here)

+// tags.
+var invalidTagNames = const {
+  'annotation-xml': '',
+  'color-profile': '',
+  'font-face': '',
+  'font-face-src': '',
+  'font-face-uri': '',
+  'font-face-format': '',
+  'font-face-name': '',
+  'missing-glyph': '',
+};
+
+/// 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 isCustomTagName(String name) {
+  if (name == null || !name.contains('-')) return false;
+  return !invalidTagNames.containsKey(name);
+}