Fix up notifications so that they aren't only on Browser IOThread.

chrome/browser/multi_process_notification.h

 // Copyright (c) 2011 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 CHROME_BROWSER_MULTI_PROCESS_NOTIFICATION_H_
 #define CHROME_BROWSER_MULTI_PROCESS_NOTIFICATION_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/message_loop.h"
 #include "base/scoped_ptr.h"
 #include "base/task.h"
 
 class Task;
 class MessageLoop;
 
 // Platform abstraction for a notification that can be sent between processes.
 // Notifications are strings. The string will be prefixed accordingly per
 // platform (so on Mac OS X a "Happy" notification will become
 // "org.chromium.Happy").
@@ skipping 65 matching lines @@
     Delegate* delegate_;
     DISALLOW_COPY_AND_ASSIGN(NotificationReceivedTask);
   };
 
   Listener(const std::string& name, Domain domain, Delegate* delegate);
 
   // A destructor is required for scoped_ptr to compile.
   ~Listener();
 
   // A listener is not considered valid until Start() returns true and its
-  // delegate's OnListenerStarted method is called with |success| == true
-  bool Start();
+  // delegate's OnListenerStarted method is called with |success| == true.
+  // |io_loop_to_listen_on| is the message loop to register the listener on.
+  // All callbacks will be made in the same thread that "Start" is called on,
+  // not the thread that owns io_loop_to_listen_on.
+  // |io_loop_to_listen_on| must be of type TYPE_IO.
+  bool Start(MessageLoop* io_loop_to_listen_on);
+
+  std::string name() const;
+  Domain domain() const;
 
  private:
   scoped_ptr<ListenerImpl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(Listener);
 };
 
 }  // namespace multi_process_notification
 
 #endif  // CHROME_BROWSER_MULTI_PROCESS_NOTIFICATION_H_