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diff --git a/src/3rdparty/v8/src/debug-agent.h b/src/3rdparty/v8/src/debug-agent.h
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+// Copyright 2006-2008 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_DEBUG_AGENT_H_
+#define V8_DEBUG_AGENT_H_
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+#include "../include/v8-debug.h"
+#include "platform.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward decelrations.
+class DebuggerAgentSession;
+
+
+// Debugger agent which starts a socket listener on the debugger port and
+// handles connection from a remote debugger.
+class DebuggerAgent: public Thread {
+ public:
+  DebuggerAgent(Isolate* isolate, const char* name, int port)
+      : Thread(isolate, name),
+        name_(StrDup(name)), port_(port),
+        server_(OS::CreateSocket()), terminate_(false),
+        session_access_(OS::CreateMutex()), session_(NULL),
+        terminate_now_(OS::CreateSemaphore(0)),
+        listening_(OS::CreateSemaphore(0)) {
+    ASSERT(Isolate::Current()->debugger_agent_instance() == NULL);
+    Isolate::Current()->set_debugger_agent_instance(this);
+  }
+  ~DebuggerAgent() {
+     Isolate::Current()->set_debugger_agent_instance(NULL);
+     delete server_;
+  }
+
+  void Shutdown();
+  void WaitUntilListening();
+
+ private:
+  void Run();
+  void CreateSession(Socket* socket);
+  void DebuggerMessage(const v8::Debug::Message& message);
+  void CloseSession();
+  void OnSessionClosed(DebuggerAgentSession* session);
+
+  SmartPointer<const char> name_;  // Name of the embedding application.
+  int port_;  // Port to use for the agent.
+  Socket* server_;  // Server socket for listen/accept.
+  bool terminate_;  // Termination flag.
+  Mutex* session_access_;  // Mutex guarging access to session_.
+  DebuggerAgentSession* session_;  // Current active session if any.
+  Semaphore* terminate_now_;  // Semaphore to signal termination.
+  Semaphore* listening_;
+
+  friend class DebuggerAgentSession;
+  friend void DebuggerAgentMessageHandler(const v8::Debug::Message& message);
+
+  DISALLOW_COPY_AND_ASSIGN(DebuggerAgent);
+};
+
+
+// Debugger agent session. The session receives requests from the remote
+// debugger and sends debugger events/responses to the remote debugger.
+class DebuggerAgentSession: public Thread {
+ public:
+  DebuggerAgentSession(Isolate* isolate, DebuggerAgent* agent, Socket* client)
+      : Thread(isolate, "v8:DbgAgntSessn"),
+        agent_(agent), client_(client) {}
+
+  void DebuggerMessage(Vector<uint16_t> message);
+  void Shutdown();
+
+ private:
+  void Run();
+
+  void DebuggerMessage(Vector<char> message);
+
+  DebuggerAgent* agent_;
+  Socket* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(DebuggerAgentSession);
+};
+
+
+// Utility methods factored out to be used by the D8 shell as well.
+class DebuggerAgentUtil {
+ public:
+  static const char* const kContentLength;
+  static const int kContentLengthSize;
+
+  static SmartPointer<char> ReceiveMessage(const Socket* conn);
+  static bool SendConnectMessage(const Socket* conn,
+                                 const char* embedding_host);
+  static bool SendMessage(const Socket* conn, const Vector<uint16_t> message);
+  static bool SendMessage(const Socket* conn,
+                          const v8::Handle<v8::String> message);
+  static int ReceiveAll(const Socket* conn, char* data, int len);
+};
+
+} }  // namespace v8::internal
+
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+#endif  // V8_DEBUG_AGENT_H_