Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/system_wrappers/source/trace_win.h

@@ -0,0 +1,37 @@
+/*
+ *  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_TRACE_WIN_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_WIN_H_
+
+#include <stdio.h>
+#include <windows.h>
+
+#include "webrtc/system_wrappers/source/trace_impl.h"
+
+namespace webrtc {
+
+class TraceWindows : public TraceImpl {
+ public:
+  TraceWindows();
+  virtual ~TraceWindows();
+
+  virtual int32_t AddTime(char* trace_message, const TraceLevel level) const;
+
+  virtual int32_t AddBuildInfo(char* trace_message) const;
+  virtual int32_t AddDateTimeInfo(char* trace_message) const;
+ private:
+  volatile mutable uint32_t prev_api_tick_count_;
+  volatile mutable uint32_t prev_tick_count_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_SOURCE_TRACE_WIN_H_