Update the Idle collector to do a full GC

include/v8.h

 // Copyright 2007-2008 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 2262 matching lines @@
    * It should generally not be necessary to dispose v8 before exiting
    * a process, this should happen automatically.  It is only necessary
    * to use if the process needs the resources taken up by v8.
    */
   static bool Dispose();
 
 
   /**
    * Optional notification that the embedder is idle.
    * V8 uses the notification to reduce memory footprint.
+   * This call can be used repeatedly if the embedder remains idle.
    * \param is_high_priority tells whether the embedder is high priority.
+   * Returns true if the embedder should stop calling IdleNotification
+   * until real work has been done.  This indicates that V8 has done
+   * as much cleanup as it will be able to do.
    */
-  static void IdleNotification(bool is_high_priority);
+  static bool IdleNotification(bool is_high_priority);
 
   /**
    * Optional notification that the system is running low on memory.
    * V8 uses these notifications to attempt to free memory.
    */
   static void LowMemoryNotification();
 
  private:
   V8();
 
@@ skipping 495 matching lines @@
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_