diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/chrome/common/process_watcher.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/chrome/common/process_watcher.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+// 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_PROCESS_WATCHER_H_
+#define CHROME_COMMON_PROCESS_WATCHER_H_
+
+#include "base/basictypes.h"
+#include "base/process_util.h"
+
+class ProcessWatcher {
+ public:
+  // This method ensures that the specified process eventually terminates, and
+  // then it closes the given process handle.
+  //
+  // It assumes that the process has already been signalled to exit, and it
+  // begins by waiting a small amount of time for it to exit.  If the process
+  // does not appear to have exited, then this function starts to become
+  // aggressive about ensuring that the process terminates.
+  //
+  // This method does not block the calling thread.
+  //
+  // NOTE: The process handle must have been opened with the PROCESS_TERMINATE
+  // and SYNCHRONIZE permissions.
+  //
+  static void EnsureProcessTerminated(base::ProcessHandle process_handle
+                                      , bool force=true
+  );
+
+ private:
+  // Do not instantiate this class.
+  ProcessWatcher();
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessWatcher);
+};
+
+#endif  // CHROME_COMMON_PROCESS_WATCHER_H_