diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/child_process.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/child_process.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+// 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 CHROME_COMMON_CHILD_PROCESS_H__
+#define CHROME_COMMON_CHILD_PROCESS_H__
+
+#include <string>
+#include <vector>
+#include "base/basictypes.h"
+#include "base/message_loop.h"
+#include "base/scoped_ptr.h"
+#include "base/waitable_event.h"
+
+class ChildThread;
+
+
+// Base class for child processes of the browser process (i.e. renderer and
+// plugin host). This is a singleton object for each child process.
+class ChildProcess {
+ public:
+  // Child processes should have an object that derives from this class.  The
+  // constructor will return once ChildThread has started.
+  ChildProcess(ChildThread* child_thread);
+  virtual ~ChildProcess();
+
+  // Getter for this process' main thread.
+  ChildThread* child_thread() { return child_thread_.get(); }
+
+  // A global event object that is signalled when the main thread's message
+  // loop exits.  This gives background threads a way to observe the main
+  // thread shutting down.  This can be useful when a background thread is
+  // waiting for some information from the browser process.  If the browser
+  // process goes away prematurely, the background thread can at least notice
+  // the child processes's main thread exiting to determine that it should give
+  // up waiting.
+  // For example, see the renderer code used to implement
+  // webkit_glue::GetCookies.
+  base::WaitableEvent* GetShutDownEvent();
+
+  // These are used for ref-counting the child process.  The process shuts
+  // itself down when the ref count reaches 0.
+  // For example, in the renderer process, generally each tab managed by this
+  // process will hold a reference to the process, and release when closed.
+  void AddRefProcess();
+  void ReleaseProcess();
+
+  // Getter for the one ChildProcess object for this process.
+  static ChildProcess* current() { return child_process_; }
+
+ private:
+  // NOTE: make sure that child_thread_ is listed before shutdown_event_, since
+  // it depends on it (indirectly through IPC::SyncChannel).
+  scoped_ptr<ChildThread> child_thread_;
+
+  int ref_count_;
+
+  // An event that will be signalled when we shutdown.
+  base::WaitableEvent shutdown_event_;
+
+  // The singleton instance for this process.
+  static ChildProcess* child_process_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(ChildProcess);
+};
+
+#endif  // CHROME_COMMON_CHILD_PROCESS_H__