Add a --harmony-object-observe runtime flag (on by default)

src/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var $observeNotifyChange;
 var $observeEnqueueSpliceRecord;
 var $observeBeginPerformSplice;
 var $observeEndPerformSplice;
 var $observeNativeObjectObserve;
 var $observeNativeObjectGetNotifier;
 var $observeNativeObjectNotifierPerformChange;
 
+var $observeObjectMethods;
+var $observeArrayMethods;
+
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalArray = global.Array;
@@ skipping 646 matching lines @@
   if (!IS_NULL(pendingObservers)) {
     SetPendingObservers(null);
     for (var i in pendingObservers) {
       CallbackDeliverPending(pendingObservers[i]);
     }
   }
 }
 
 // -------------------------------------------------------------------
 
-utils.InstallFunctions(GlobalObject, DONT_ENUM, [
-  "deliverChangeRecords", ObjectDeliverChangeRecords,
-  "getNotifier", ObjectGetNotifier,
-  "observe", ObjectObserve,
-  "unobserve", ObjectUnobserve
-]);
-utils.InstallFunctions(GlobalArray, DONT_ENUM, [
-  "observe", ArrayObserve,
-  "unobserve", ArrayUnobserve
-]);
 utils.InstallFunctions(notifierPrototype, DONT_ENUM, [
   "notify", ObjectNotifierNotify,
   "performChange", ObjectNotifierPerformChange
 ]);
 
+$observeObjectMethods = [
+  "deliverChangeRecords", ObjectDeliverChangeRecords,
+  "getNotifier", ObjectGetNotifier,
+  "observe", ObjectObserve,
+  "unobserve", ObjectUnobserve
+];
+$observeArrayMethods = [
+  "observe", ArrayObserve,
+  "unobserve", ArrayUnobserve
+];
+
+// TODO(adamk): Figure out why this prototype removal has to
+// happen as part of initial snapshotting.
+var removePrototypeFn = function(f, i) {
+  if (i % 2 === 1) %FunctionRemovePrototype(f);
+};
+$observeObjectMethods.forEach(removePrototypeFn);
+$observeArrayMethods.forEach(removePrototypeFn);
+
 $observeNotifyChange = NotifyChange;
 $observeEnqueueSpliceRecord = EnqueueSpliceRecord;
 $observeBeginPerformSplice = BeginPerformSplice;
 $observeEndPerformSplice = EndPerformSplice;
 $observeNativeObjectObserve = NativeObjectObserve;
 $observeNativeObjectGetNotifier = NativeObjectGetNotifier;
 $observeNativeObjectNotifierPerformChange = NativeObjectNotifierPerformChange;
 
 })