Extend debugger agent protocol with a connect message

src/d8-debug.cc

 // 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 287 matching lines @@
   if (request->IsUndefined()) {
     return;
   }
 
   // Send the JSON debugger request.
   i::DebuggerAgentUtil::SendMessage(conn_, Handle<String>::Cast(request));
 }
 
 
 void ReceiverThread::Run() {
+  // Receive the connect message (with empty body).
+  i::SmartPointer<char> message =
+    i::DebuggerAgentUtil::ReceiveMessage(remote_debugger_->conn());
+  ASSERT(*message == NULL);
+
   while (true) {
     // Receive a message.
     i::SmartPointer<char> message =
       i::DebuggerAgentUtil::ReceiveMessage(remote_debugger_->conn());
     if (*message == NULL) {
       remote_debugger_->ConnectionClosed();
       return;
     }
 
     // Pass the message to the main thread.
@@ skipping 13 matching lines @@
     }
 
     // Pass the keyboard command to the main thread.
     remote_debugger_->KeyboardCommand(
         i::SmartPointer<char>(i::StrDup(command)));
   }
 }
 
 
 }  // namespace v8