Implement issue 549 Make V8 call DebugMessageDispatchHandler with Locker locked

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 206 matching lines @@
                                      int period = 100);
 
   /**
    * Register a callback function to be called when a debug message has been
    * received and is ready to be processed. For the debug messages to be
    * processed V8 needs to be entered, and in certain embedding scenarios this
    * callback can be used to make sure V8 is entered for the debug message to
    * be processed. Note that debug messages will only be processed if there is
    * a V8 break. This can happen automatically by using the option
    * --debugger-auto-break.
+   * \param provide_locker requires that V8 acquires v8::Locker for you before
+   *        calling handler
    */
   static void SetDebugMessageDispatchHandler(
-      DebugMessageDispatchHandler handler);
+      DebugMessageDispatchHandler handler, bool provide_locker = false);
 
  /**
   * Run a JavaScript function in the debugger.
   * \param fun the function to call
   * \param data passed as second argument to the function
   * With this call the debugger is entered and the function specified is called
   * with the execution state as the first argument. This makes it possible to
   * get access to information otherwise not available during normal JavaScript
   * execution e.g. details on stack frames. The following example show a
   * JavaScript function which when passed to v8::Debug::Call will return the
@@ skipping 63 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef EXPORT
 
 
 #endif  // V8_V8_DEBUG_H_