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diff --git a/ipc/ipc_logging.h b/ipc/ipc_logging.h
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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IPC_IPC_LOGGING_H_
+#define IPC_IPC_LOGGING_H_
+
+#include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
+
+#ifdef IPC_MESSAGE_LOG_ENABLED
+
+#include "base/lock.h"
+#include "base/message_loop.h"
+#include "base/singleton.h"
+#include "base/waitable_event_watcher.h"
+#include "ipc/ipc_message_utils.h"
+
+class MessageLoop;
+
+namespace IPC {
+
+class Message;
+
+// One instance per process.  Needs to be created on the main thread (the UI
+// thread in the browser) but OnPreDispatchMessage/OnPostDispatchMessage
+// can be called on other threads.
+class Logging : public base::WaitableEventWatcher::Delegate,
+                public MessageLoop::DestructionObserver {
+ public:
+  // Implemented by consumers of log messages.
+  class Consumer {
+   public:
+    virtual void Log(const LogData& data) = 0;
+  };
+
+  void SetConsumer(Consumer* consumer);
+
+  ~Logging();
+  static Logging* current();
+
+  void Enable();
+  void Disable();
+  bool Enabled() const { return enabled_; }
+
+  // Called by child processes to give the logger object the channel to send
+  // logging data to the browser process.
+  void SetIPCSender(Message::Sender* sender);
+
+  // Called in the browser process when logging data from a child process is
+  // received.
+  void OnReceivedLoggingMessage(const Message& message);
+
+  void OnSendMessage(Message* message, const std::wstring& channel_id);
+  void OnPreDispatchMessage(const Message& message);
+  void OnPostDispatchMessage(const Message& message,
+                             const std::wstring& channel_id);
+
+  // Returns the name of the logging enabled/disabled events so that the
+  // sandbox can add them to to the policy.  If true, gets the name of the
+  // enabled event, if false, gets the name of the disabled event.
+  static std::wstring GetEventName(bool enabled);
+
+  // Like the *MsgLog functions declared for each message class, except this
+  // calls the correct one based on the message type automatically.  Defined in
+  // ipc_logging.cc.
+  static void GetMessageText(uint16 type, std::wstring* name,
+                             const Message* message, std::wstring* params);
+
+  // WaitableEventWatcher::Delegate implementation
+  void OnWaitableEventSignaled(base::WaitableEvent* event);
+
+  // MessageLoop::DestructionObserver implementation
+  void WillDestroyCurrentMessageLoop();
+
+  typedef void (*LogFunction)(uint16 type,
+                              std::wstring* name,
+                              const Message* msg,
+                              std::wstring* params);
+
+  static void SetLoggerFunctions(LogFunction *functions);
+
+ private:
+  friend struct DefaultSingletonTraits<Logging>;
+  Logging();
+
+  std::wstring GetEventName(int browser_pid, bool enabled);
+  void OnSendLogs();
+  void Log(const LogData& data);
+
+  void RegisterWaitForEvent(bool enabled);
+
+  base::WaitableEventWatcher watcher_;
+
+  scoped_ptr<base::WaitableEvent> logging_event_on_;
+  scoped_ptr<base::WaitableEvent> logging_event_off_;
+  bool enabled_;
+
+  std::vector<LogData> queued_logs_;
+  bool queue_invoke_later_pending_;
+
+  Message::Sender* sender_;
+  MessageLoop* main_thread_;
+
+  Consumer* consumer_;
+
+  static LogFunction *log_function_mapping_;
+};
+
+}  // namespace IPC
+
+#endif // IPC_MESSAGE_LOG_ENABLED
+
+#endif  // IPC_IPC_LOGGING_H_