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diff --git a/third_party/libwebrtc/system_wrappers/include/sleep.h b/third_party/libwebrtc/system_wrappers/include/sleep.h
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+/*
+ * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+// An OS-independent sleep function.
+
+#ifndef SYSTEM_WRAPPERS_INCLUDE_SLEEP_H_
+#define SYSTEM_WRAPPERS_INCLUDE_SLEEP_H_
+
+namespace webrtc {
+
+// This function sleeps for the specified number of milliseconds.
+// It may return early if the thread is woken by some other event,
+// such as the delivery of a signal on Unix.
+void SleepMs(int msecs);
+
+} // namespace webrtc
+
+#endif // SYSTEM_WRAPPERS_INCLUDE_SLEEP_H_