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diff --git a/chromium/chrome/common/process_singleton_lock_posix.h b/chromium/chrome/common/process_singleton_lock_posix.h
new file mode 100644
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+++ b/chromium/chrome/common/process_singleton_lock_posix.h
@@ -0,0 +1,20 @@
+// Copyright 2019 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_SINGLETON_LOCK_POSIX_H_
+#define CHROME_COMMON_PROCESS_SINGLETON_LOCK_POSIX_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+
+// Extract the hostname and pid from the lock symlink. Returns true if the lock
+// existed. See ProcessSingleton for additional details.
+bool ParseProcessSingletonLock(const base::FilePath& path,
+                               std::string* hostname,
+                               int* pid);
+
+extern const char kProcessSingletonLockDelimiter;
+
+#endif  // CHROME_COMMON_PROCESS_SINGLETON_LOCK_POSIX_H_