Add a base class for objects that want to filter messages on the UI thread. ...

chrome/browser/browser_io_message_filter.h

+// Copyright (c) 2010 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_BROWSER_IO_MESSAGE_FILTER_H_
+#define CHROME_BROWSER_BROWSER_IO_MESSAGE_FILTER_H_
+#pragma once
+
+#include "base/process.h"
+#include "ipc/ipc_channel_proxy.h"
+
+// Base class for message filters in the browser process that reside on the IO
+// thread.
+class BrowserIOMessageFilter : public IPC::ChannelProxy::MessageFilter,
+                               public IPC::Message::Sender {
+ public:
+  BrowserIOMessageFilter();
+  virtual ~BrowserIOMessageFilter();
+
+  // IPC::ChannelProxy::MessageFilter methods.  If you override them, make sure
+  // to call them as well.
+  virtual void OnFilterAdded(IPC::Channel* channel);
+  virtual void OnChannelClosing();
+  virtual void OnChannelConnected(int32 peer_pid);
+
+  // IPC::Message::Sender implementation:
+  virtual bool Send(IPC::Message* msg);
+
+ protected:
+  base::ProcessHandle peer_handle() { return peer_handle_; }
+
+ private:
+  IPC::Channel* channel_;
+  base::ProcessHandle peer_handle_;
+};
+
+#endif  // CHROME_BROWSER_BROWSER_IO_MESSAGE_FILTER_H_