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/transient/daubechies_8_wavelet_coeffs.h

@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+// This header file defines the coefficients of the FIR based approximation of
+// the Meyer Wavelet
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_DAUBECHIES_8_WAVELET_COEFFS_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_DAUBECHIES_8_WAVELET_COEFFS_H_
+
+// Decomposition coefficients Daubechies 8.
+
+namespace webrtc {
+
+const int kDaubechies8CoefficientsLength = 16;
+
+const float kDaubechies8HighPassCoefficients[kDaubechies8CoefficientsLength]
+    = {
+  -5.44158422430816093862e-02f,
+  3.12871590914465924627e-01f,
+  -6.75630736298012846142e-01f,
+  5.85354683654869090148e-01f,
+  1.58291052560238926228e-02f,
+  -2.84015542962428091389e-01f,
+  -4.72484573997972536787e-04f,
+  1.28747426620186011803e-01f,
+  1.73693010020221083600e-02f,
+  -4.40882539310647192377e-02f,
+  -1.39810279170155156436e-02f,
+  8.74609404701565465445e-03f,
+  4.87035299301066034600e-03f,
+  -3.91740372995977108837e-04f,
+  -6.75449405998556772109e-04f,
+  -1.17476784002281916305e-04f
+};
+
+const float kDaubechies8LowPassCoefficients[kDaubechies8CoefficientsLength] = {
+  -1.17476784002281916305e-04f,
+  6.75449405998556772109e-04f,
+  -3.91740372995977108837e-04f,
+  -4.87035299301066034600e-03f,
+  8.74609404701565465445e-03f,
+  1.39810279170155156436e-02f,
+  -4.40882539310647192377e-02f,
+  -1.73693010020221083600e-02f,
+  1.28747426620186011803e-01f,
+  4.72484573997972536787e-04f,
+  -2.84015542962428091389e-01f,
+  -1.58291052560238926228e-02f,
+  5.85354683654869090148e-01f,
+  6.75630736298012846142e-01f,
+  3.12871590914465924627e-01f,
+  5.44158422430816093862e-02f
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_DAUBECHIES_8_WAVELET_COEFFS_H_