Adding Date::ResetCache() API so that the cache values in the Date object...

include/v8.h

Index: include/v8.h
===================================================================
--- include/v8.h	(revision 6063)
+++ include/v8.h	(working copy)
@@ -1355,6 +1355,21 @@
   V8EXPORT double NumberValue() const;
 
   static inline Date* Cast(v8::Value* obj);
+
+  /**
+   * Notification that the embedder has changed the time zone,
+   * daylight savings time, or other date / time configuration
+   * parameters.  V8 keeps a cache of various values used for
+   * date / time computation.  This notification will reset
+   * those cached values for the current context so that date /
+   * time configuration changes would be reflected in the Date
+   * object.
+   *
+   * This API should not be called more than needed as it will
+   * negatively impact the performance of date operations.
+   */
+  V8EXPORT static void DateTimeConfigurationChangeNotification();
+
  private:
   V8EXPORT static void CheckCast(v8::Value* obj);
 };