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/modules/audio_processing/beamformer/array_util.h

@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2015 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_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_
+
+#include <cmath>
+
+namespace webrtc {
+
+// Coordinates in meters.
+template<typename T>
+struct CartesianPoint {
+  CartesianPoint(T x, T y, T z) {
+    c[0] = x;
+    c[1] = y;
+    c[2] = z;
+  }
+  T x() const { return c[0]; }
+  T y() const { return c[1]; }
+  T z() const { return c[2]; }
+  T c[3];
+};
+
+using Point = CartesianPoint<float>;
+
+template<typename T>
+float Distance(CartesianPoint<T> a, CartesianPoint<T> b) {
+  return std::sqrt((a.x() - b.x()) * (a.x() - b.x()) +
+                   (a.y() - b.y()) * (a.y() - b.y()) +
+                   (a.z() - b.z()) * (a.z() - b.z()));
+}
+
+template <typename T>
+struct SphericalPoint {
+  SphericalPoint(T azimuth, T elevation, T radius) {
+    s[0] = azimuth;
+    s[1] = elevation;
+    s[2] = radius;
+  }
+  T azimuth() const { return s[0]; }
+  T elevation() const { return s[1]; }
+  T distance() const { return s[2]; }
+  T s[3];
+};
+
+using SphericalPointf = SphericalPoint<float>;
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_