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diff --git a/webrtc/system_wrappers/include/condition_variable_wrapper.h b/webrtc/system_wrappers/include/condition_variable_wrapper.h
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+/*
+ * Copyright (c) 2011 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.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CONDITION_VARIABLE_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CONDITION_VARIABLE_WRAPPER_H_
+
+namespace webrtc {
+
+class CriticalSectionWrapper;
+
+class ConditionVariableWrapper {
+ public:
+ // Factory method, constructor disabled.
+ static ConditionVariableWrapper* CreateConditionVariable();
+
+ virtual ~ConditionVariableWrapper() {}
+
+ // Calling thread will atomically release crit_sect and wait until next
+ // some other thread calls Wake() or WakeAll().
+ virtual void SleepCS(CriticalSectionWrapper& crit_sect) = 0;
+
+ // Same as above but with a timeout.
+ virtual bool SleepCS(CriticalSectionWrapper& crit_sect,
+ unsigned long max_time_in_ms) = 0;
+
+ // Wakes one thread calling SleepCS().
+ virtual void Wake() = 0;
+
+ // Wakes all threads calling SleepCS().
+ virtual void WakeAll() = 0;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CONDITION_VARIABLE_WRAPPER_H_