Add API for access checks on observed objects

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index b35500dd5e3712f843ad8847cef404a40eb0896a..41e59de1cdbcc7e8bfa433ca38f2f204a878492d 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2205,6 +2205,15 @@ typedef bool (*IndexedSecurityCallback)(Local<Object> host,
 
 
 /**
+ * Returns true if cross-context access should be allowed to
+ * observe data property mutations on the given host object.
+ *
+ * Only called when the --harmony-observation switch is enabled.
+ */
+typedef bool (*ObserveSecurityCallback)(Local<Object> host, Local<Value> data);
+
+
+/**
  * A FunctionTemplate is used to create functions at runtime. There
  * can only be one function created from a FunctionTemplate in a
  * context.  The lifetime of the created function is equal to the
@@ -2523,6 +2532,15 @@ class V8EXPORT ObjectTemplate : public Template {
    */
   void SetAccessCheckCallbacks(NamedSecurityCallback named_handler,
                                IndexedSecurityCallback indexed_handler,
+                               ObserveSecurityCallback observe_handler,
+                               Handle<Value> data = Handle<Value>(),
+                               bool turned_on_by_default = true);
+
+  /**
+   * Deprecated, call the 5-argument version instead.
+   */
+  void SetAccessCheckCallbacks(NamedSecurityCallback named_handler,
+                               IndexedSecurityCallback indexed_handler,
                                Handle<Value> data = Handle<Value>(),
                                bool turned_on_by_default = true);