Frog: preserve initialization order.

frog/gen.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.
 
 /**
  * Top level generator object for writing code and keeping track of
  * dependencies.
  *
  * Should have two compilation models, but only one implemented so far.
  *
@@ skipping 1048 matching lines @@
       if (parentType != null && !parentType.isObject) {
         // TODO(jmesserly): we could omit this if all supertypes are using
         // default constructors.
         initializerCall = new CallExpression(
             new SuperExpression(method.span), [], method.span);
       }
     }
 
     if (method.isConstructor && newObject is ObjectValue) {
       var fields = newObject.dynamic.fields;
-      for (var field in fields.getKeys()) {
-        var value = fields[field];
-        if (value !== null) {
-          writer.writeln('this.${field.jsname} = ${value.code};');
+      for (var field in newObject.dynamic.fieldsInInitOrder) {
+        if (field !== null) {
+          var value = fields[field];
+          if (value !== null) {
+            writer.writeln('this.${field.jsname} = ${value.code};');
+          }
         }
       }
     }
 
     // TODO(jimhug): Doing this call last does not match spec.
     if (initializerCall != null) {
       evalInitializerCall(newObject, initializerCall, fieldsSet);
     }
 
     if (method.isConstructor && newObject !== null && newObject.isConst) {
@@ skipping 1398 matching lines @@
     return true;
   }
 
 }
 
 class ReturnKind {
   static final int IGNORE = 1;
   static final int POST = 2;
   static final int PRE = 3;
 }