Record default clause for interfaces in parser.

lib/compiler/implementation/scanner/listener.dart

Index: lib/compiler/implementation/scanner/listener.dart
diff --git a/lib/compiler/implementation/scanner/listener.dart b/lib/compiler/implementation/scanner/listener.dart
index 7d18d4d8ed3ea36f354eb1bb7fb119a0ae8c23ac..d1fe3adcaba4d3ee31130a7a7d013ea803019087 100644
--- a/lib/compiler/implementation/scanner/listener.dart
+++ b/lib/compiler/implementation/scanner/listener.dart
@@ -590,15 +590,16 @@ class ElementListener extends Listener {
 
   void endInterface(int supertypeCount, Token interfaceKeyword,
                     Token extendsKeyword, Token endToken) {
-    // TODO(ahe): Record the defaultClause.
     Node defaultClause = popNode();
     NodeList supertypes =
         makeNodeList(supertypeCount, extendsKeyword, null, ",");
     NodeList typeParameters = popNode();
     Identifier name = popNode();
     int id = idGenerator();
-    pushElement(new PartialClassElement(
-        name.source, interfaceKeyword, endToken, compilationUnitElement, id));
+    ClassElement element = new PartialClassElement(
+        name.source, interfaceKeyword, endToken, compilationUnitElement, id);
+    pushElement(element);
+    if (defaultClause !== null) element.defaultClause = defaultClause;
   }
 
   void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {