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diff --git a/src/system_wrappers/interface/condition_variable_wrapper.h b/src/system_wrappers/interface/condition_variable_wrapper.h
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+++ b/src/system_wrappers/interface/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_INTERFACE_CONDITION_VARIABLE_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_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 critSect and wait until next
+    // some other thread calls Wake() or WakeAll().
+    virtual void SleepCS(CriticalSectionWrapper& critSect) = 0;
+
+    // Same as above but with a timeout.
+    virtual bool SleepCS(CriticalSectionWrapper& critSect,
+                         unsigned long maxTimeInMS) = 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_INTERFACE_CONDITION_VARIABLE_WRAPPER_H_