Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/system_wrappers/source/event.cc

@@ -0,0 +1,33 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/system_wrappers/interface/event_wrapper.h"
+
+#if defined(_WIN32)
+#include <windows.h>
+#include "webrtc/system_wrappers/source/event_win.h"
+#elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
+#include <ApplicationServices/ApplicationServices.h>
+#include <pthread.h>
+#include "webrtc/system_wrappers/source/event_posix.h"
+#else
+#include <pthread.h>
+#include "webrtc/system_wrappers/source/event_posix.h"
+#endif
+
+namespace webrtc {
+EventWrapper* EventWrapper::Create() {
+#if defined(_WIN32)
+  return new EventWindows();
+#else
+  return EventPosix::Create();
+#endif
+}
+}  // namespace webrtc