Sort the output (for now just the classes and instance members).

lib/compiler/implementation/scanner/class_element_parser.dart

Index: lib/compiler/implementation/scanner/class_element_parser.dart
diff --git a/lib/compiler/implementation/scanner/class_element_parser.dart b/lib/compiler/implementation/scanner/class_element_parser.dart
index ef0ebe5dfb6b2931265730cd26d136e07249a646..e958c67b2b413a7214423871c4c873828032e777 100644
--- a/lib/compiler/implementation/scanner/class_element_parser.dart
+++ b/lib/compiler/implementation/scanner/class_element_parser.dart
@@ -16,8 +16,9 @@ class PartialClassElement extends ClassElement {
   PartialClassElement(SourceString name,
                       Token this.beginToken,
                       Token this.endToken,
-                      CompilationUnitElement enclosing)
-    : super(name, enclosing);
+                      CompilationUnitElement enclosing,
+                      int id)
+    : super(name, enclosing, id);
 
   ClassNode parseNode(DiagnosticListener diagnosticListener) {
     if (cachedNode != null) return cachedNode;