diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/child_process.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/child_process.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,59 @@
+// 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.
+
+#include "chrome/common/child_process.h"
+
+#include "base/basictypes.h"
+#include "base/string_util.h"
+#include "chrome/common/child_thread.h"
+
+ChildProcess* ChildProcess::child_process_;
+
+ChildProcess::ChildProcess(ChildThread* child_thread)
+    : child_thread_(child_thread),
+      ref_count_(0),
+      shutdown_event_(true, false) {
+  DCHECK(!child_process_);
+  child_process_ = this;
+  if (child_thread_.get())  // null in unittests.
+    child_thread_->Run();
+}
+
+ChildProcess::~ChildProcess() {
+  DCHECK(child_process_ == this);
+
+  // Signal this event before destroying the child process.  That way all
+  // background threads can cleanup.
+  // For example, in the renderer the RenderThread instances will be able to
+  // notice shutdown before the render process begins waiting for them to exit.
+  shutdown_event_.Signal();
+
+  if (child_thread_.get())
+    child_thread_->Stop();
+
+  child_process_ = NULL;
+}
+
+void ChildProcess::AddRefProcess() {
+  DCHECK(!child_thread_.get() ||  // null in unittests.
+         MessageLoop::current() == child_thread_->message_loop());
+  ref_count_++;
+}
+
+void ChildProcess::ReleaseProcess() {
+  DCHECK(!child_thread_.get() ||  // null in unittests.
+         MessageLoop::current() == child_thread_->message_loop());
+  DCHECK(ref_count_);
+  DCHECK(child_process_);
+  if (--ref_count_)
+    return;
+
+  if (child_thread_.get())  // null in unittests.
+    child_thread_->OnProcessFinalRelease();
+}
+
+base::WaitableEvent* ChildProcess::GetShutDownEvent() {
+  DCHECK(child_process_);
+  return &child_process_->shutdown_event_;
+}