Fix ApiDoc to work with new dart:html code. Tweak dart:html generator to generate clearer @domName …

lib/dartdoc/dartdoc.dart

 // 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.
 
 /**
  * To generate docs for a library, run this script with the path to an
  * entrypoint .dart file, like:
  *
  *     $ dart dartdoc.dart foo.dart
  *
@@ skipping 963 matching lines @@
       writeln('</pre>');
     }
 
     writeln('</div>');
   }
 
   /** Get the doc comment associated with the given type. */
   String getTypeComment(Type type) {
     String comment = _comments.find(type.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
   /** Get the doc comment associated with the given method. */
   String getMethodComment(MethodMember method) {
     String comment = _comments.find(method.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
   /** Get the doc comment associated with the given field. */
   String getFieldComment(FieldMember field) {
     String comment = _comments.find(field.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
+  String commentToHtml(String comment) => md.markdownToHtml(comment);
+
   /**
    * Converts [fullPath] which is understood to be a full path from the root of
    * the generated docs to one relative to the current file.
    */
   String relativePath(String fullPath) {
     // Don't make it relative if it's an absolute path.
     if (isAbsolute(fullPath)) return fullPath;
 
     // TODO(rnystrom): Walks all the way up to root each time. Shouldn't do
     // this if the paths overlap.
@@ skipping 267 matching lines @@
 
     return new md.Element.text('code', name);
   }
 
   // TODO(rnystrom): Move into SourceSpan?
   int getSpanColumn(SourceSpan span) {
     final line = span.file.getLine(span.start);
     return span.file.getColumn(line, span.start);
   }
 }