Decouple IPC::MessageFilter from IPC::Channel

content/browser/browser_message_filter_peer.h

Index: content/browser/browser_message_filter_peer.h
diff --git a/content/browser/browser_message_filter_peer.h b/content/browser/browser_message_filter_peer.h
new file mode 100644
index 0000000000000000000000000000000000000000..00d9d70480448c0eb86530387fa0ea0446bf15ff
--- /dev/null
+++ b/content/browser/browser_message_filter_peer.h
@@ -0,0 +1,41 @@
+// Copyright (c) 2014 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 CONTENT_BROWSER_BROWSER_MESSAGE_FILTER_PEER_H_
+#define CONTENT_BROWSER_BROWSER_MESSAGE_FILTER_PEER_H_
+
+#include "base/process/process.h"
+#include "content/common/content_export.h"
+
+#if defined(OS_WIN)
+#include "base/synchronization/lock.h"
+#endif
+
+namespace content {
+
+class CONTENT_EXPORT BrowserMessageFilterPeer {
+ public:
+  BrowserMessageFilterPeer();
+  explicit BrowserMessageFilterPeer(base::ProcessId pid);
+
+  void BadMessageReceived();
+  base::ProcessHandle GetHandle();
+
+  base::ProcessId pid() const { return pid_; }
+  void set_pid(base::ProcessId pid) { pid_ = pid; }
+
+ private:
+  base::ProcessId pid_;
+
+#if defined(OS_WIN)
+  base::Lock handle_lock_;
+  base::ProcessHandle handle_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserMessageFilterPeer);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BROWSER_MESSAGE_FILTER_PEER_H_