Update audio_processing module

Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1

Update notes:

 * Pull in third party license file

 * Replace .gypi files with BUILD.gn to keep track of what changes
   upstream

 * Bunch of new filse pulled in as dependencies

 * Won't build yet due to changes needed on top of these

webrtc/system_wrappers/source/event_timer_win.h

@@ -0,0 +1,40 @@
+/*
+ *  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_EVENT_WIN_H_
+#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_WIN_H_
+
+#include <windows.h>
+
+#include "webrtc/system_wrappers/interface/event_wrapper.h"
+
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class EventTimerWin : public EventTimerWrapper {
+ public:
+  EventTimerWin();
+  virtual ~EventTimerWin();
+
+  virtual EventTypeWrapper Wait(unsigned long max_time);
+  virtual bool Set();
+
+  virtual bool StartTimer(bool periodic, unsigned long time);
+  virtual bool StopTimer();
+
+ private:
+  HANDLE  event_;
+  uint32_t timerID_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SYSTEM_WRAPPERS_SOURCE_EVENT_WIN_H_