Debugger message handler can be called from V8 thread

include/v8-debug.h

 // Copyright 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 113 matching lines @@
                                     Handle<Value> data = Handle<Value>());
 
   // Set a JavaScript debug event listener.
   static bool SetDebugEventListener(v8::Handle<v8::Object> that,
                                     Handle<Value> data = Handle<Value>());
 
   // Break execution of JavaScript.
   static void DebugBreak();
 
   // Message based interface. The message protocol is JSON.
-  static void SetMessageHandler(DebugMessageHandler handler, void* data = NULL);
+  static void SetMessageHandler(DebugMessageHandler handler, void* data = NULL,
+                                bool message_handler_thread = true);
   static void SendCommand(const uint16_t* command, int length);
 
   // Dispatch interface.
   static void SetHostDispatchHandler(DebugHostDispatchHandler handler,
                                      void* data = NULL);
   static void SendHostDispatch(void* dispatch);
 
  /**
   * Run a JavaScript function in the debugger.
   * \param fun the function to call
@@ skipping 24 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef EXPORT
 
 
 #endif  // V8_DEBUG_H_