Changed the debugger API to allow only one debug event listener to be registe...

src/debug.h

Index: src/debug.h
===================================================================
--- src/debug.h	(revision 1198)
+++ src/debug.h	(working copy)
@@ -372,6 +372,7 @@
   static void OnNewFunction(Handle<JSFunction> fun);
   static void ProcessDebugEvent(v8::DebugEvent event,
                                 Handle<Object> event_data);
+  static void SetEventListener(Handle<Object> callback, Handle<Object> data);
   static void SetMessageHandler(v8::DebugMessageHandler handler, void* data);
   static void SendMessage(Vector<uint16_t> message);
   static void ProcessCommand(Vector<const uint16_t> command);
@@ -397,6 +398,8 @@
   static bool is_loading_debugger() { return Debugger::is_loading_debugger_; }
 
  private:
+  static Handle<Object> event_listener_;  // Global handle to listener
+  static Handle<Object> event_listener_data_;
   static bool debugger_active_;  // Are there any active debugger?
   static bool compiling_natives_;  // Are we compiling natives?
   static bool is_loading_debugger_;  // Are we loading the debugger?