Lots of stuff hooking up markdown to dartdoc.

utils/dartdoc/classify.dart

Index: utils/dartdoc/classify.dart
diff --git a/utils/dartdoc/classify.dart b/utils/dartdoc/classify.dart
index f2de3cb84760f321708cbe31f330cdb0d943835a..aad85f5c87ea106f7490b7e9f50794e7de945e1f 100644
--- a/utils/dartdoc/classify.dart
+++ b/utils/dartdoc/classify.dart
@@ -48,7 +48,7 @@ String classifySource(SourceFile src) {
     }
 
     final kind = classify(token);
-    final text = htmlEscape(token.text);
+    final text = md.escapeHtml(token.text);
     if (kind != null) {
       // Add a secondary class to tokens appearing within a string so that
       // we can highlight tokens in an interpolation specially.
@@ -66,12 +66,6 @@ String classifySource(SourceFile src) {
   return html.toString();
 }
 
-// TODO(rnystrom): should exist in standard lib somewhere
-String htmlEscape(String text) {
-  return text.replaceAll('&', '&').replaceAll(
-      '>', '&gt;').replaceAll('<', '&lt;');
-}
-
 bool _looksLikeType(String name) {
   // If the name looks like an UppercaseName, assume it's a type.
   return _looksLikePublicType(name) || _looksLikePrivateType(name);