Object.observe: include oldValue in change records,

test/mjsunit/harmony/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 232 matching lines @@
 ]);
 
 // Observing named properties.
 reset();
 var obj = {a: 1}
 Object.observe(obj, observer.callback);
 obj.a = 2;
 obj["a"] = 3;
 delete obj.a;
 obj.a = 4;
+obj.a = 4;  // ignored
 obj.a = 5;
 Object.defineProperty(obj, "a", {value: 6});
 Object.defineProperty(obj, "a", {writable: false});
 obj.a = 7;  // ignored
 Object.defineProperty(obj, "a", {value: 8});
+Object.defineProperty(obj, "a", {value: 7, writable: true});
+Object.defineProperty(obj, "a", {get: function() {}});
 Object.defineProperty(obj, "a", {get: function() {}});
 delete obj.a;
-Object.defineProperty(obj, "a", {get: function() {}});
+delete obj.a;
+Object.defineProperty(obj, "a", {get: function() {}, configurable: true});
+Object.defineProperty(obj, "a", {value: 9, writable: true});
+obj.a = 10;
 Object.deliverChangeRecords(observer.callback);
-// TODO(observe): oldValue not included yet.
 observer.assertCallbackRecords([
-  { object: obj, name: "a", type: "updated" },
-  { object: obj, name: "a", type: "updated" },
-  { object: obj, name: "a", type: "deleted" },
+  { object: obj, name: "a", type: "updated", oldValue: 1 },
+  { object: obj, name: "a", type: "updated", oldValue: 2 },
+  { object: obj, name: "a", type: "deleted", oldValue: 3 },
   { object: obj, name: "a", type: "new" },
-  { object: obj, name: "a", type: "updated" },
-  { object: obj, name: "a", type: "updated" },
-  { object: obj, name: "a", type: "reconfigured" },
-  { object: obj, name: "a", type: "updated" },
+  { object: obj, name: "a", type: "updated", oldValue: 4 },
+  { object: obj, name: "a", type: "updated", oldValue: 5 },
+  { object: obj, name: "a", type: "reconfigured", oldValue: 6 },
+  { object: obj, name: "a", type: "updated", oldValue: 6 },
+  { object: obj, name: "a", type: "reconfigured", oldValue: 8 },
+  { object: obj, name: "a", type: "reconfigured", oldValue: 7 },
   { object: obj, name: "a", type: "reconfigured" },
   { object: obj, name: "a", type: "deleted" },
   { object: obj, name: "a", type: "new" },
+  { object: obj, name: "a", type: "reconfigured" },
+  { object: obj, name: "a", type: "updated", oldValue: 9 },
 ]);