Update system_wrappers

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

webrtc/system_wrappers/source/critical_section_win.h

@@ -0,0 +1,38 @@
+/*
+ *  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_SOURCE_CRITICAL_SECTION_WIN_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WIN_H_
+
+#include <windows.h>
+#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class CriticalSectionWindows : public CriticalSectionWrapper {
+ public:
+  CriticalSectionWindows();
+
+  virtual ~CriticalSectionWindows();
+
+  virtual void Enter();
+  virtual void Leave();
+
+ private:
+  CRITICAL_SECTION crit;
+
+  friend class ConditionVariableEventWin;
+  friend class ConditionVariableNativeWin;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CRITICAL_SECTION_WIN_H_