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/matrix_test_helpers.h

@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2014 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_MATRIX_TEST_HELPERS_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_MATRIX_TEST_HELPERS_H_
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/modules/audio_processing/beamformer/complex_matrix.h"
+#include "webrtc/modules/audio_processing/beamformer/matrix.h"
+
+namespace {
+const float kTolerance = 0.001f;
+}
+
+namespace webrtc {
+
+using std::complex;
+
+// Functions used in both matrix_unittest and complex_matrix_unittest.
+class MatrixTestHelpers {
+ public:
+  template <typename T>
+  static void ValidateMatrixEquality(const Matrix<T>& expected,
+                                     const Matrix<T>& actual) {
+    EXPECT_EQ(expected.num_rows(), actual.num_rows());
+    EXPECT_EQ(expected.num_columns(), actual.num_columns());
+
+    const T* const* expected_elements = expected.elements();
+    const T* const* actual_elements = actual.elements();
+    for (int i = 0; i < expected.num_rows(); ++i) {
+      for (int j = 0; j < expected.num_columns(); ++j) {
+        EXPECT_EQ(expected_elements[i][j], actual_elements[i][j]);
+      }
+    }
+  }
+
+  static void ValidateMatrixEqualityFloat(const Matrix<float>& expected,
+                                          const Matrix<float>& actual) {
+    EXPECT_EQ(expected.num_rows(), actual.num_rows());
+    EXPECT_EQ(expected.num_columns(), actual.num_columns());
+
+    const float* const* expected_elements = expected.elements();
+    const float* const* actual_elements = actual.elements();
+    for (int i = 0; i < expected.num_rows(); ++i) {
+      for (int j = 0; j < expected.num_columns(); ++j) {
+        EXPECT_NEAR(expected_elements[i][j], actual_elements[i][j], kTolerance);
+      }
+    }
+  }
+
+  static void ValidateMatrixEqualityComplexFloat(
+      const Matrix<complex<float> >& expected,
+      const Matrix<complex<float> >& actual) {
+    EXPECT_EQ(expected.num_rows(), actual.num_rows());
+    EXPECT_EQ(expected.num_columns(), actual.num_columns());
+
+    const complex<float>* const* expected_elements = expected.elements();
+    const complex<float>* const* actual_elements = actual.elements();
+    for (int i = 0; i < expected.num_rows(); ++i) {
+      for (int j = 0; j < expected.num_columns(); ++j) {
+        EXPECT_NEAR(expected_elements[i][j].real(),
+                    actual_elements[i][j].real(),
+                    kTolerance);
+        EXPECT_NEAR(expected_elements[i][j].imag(),
+                    actual_elements[i][j].imag(),
+                    kTolerance);
+      }
+    }
+  }
+
+  static void ValidateMatrixNearEqualityComplexFloat(
+      const Matrix<complex<float> >& expected,
+      const Matrix<complex<float> >& actual,
+      float tolerance) {
+    EXPECT_EQ(expected.num_rows(), actual.num_rows());
+    EXPECT_EQ(expected.num_columns(), actual.num_columns());
+
+    const complex<float>* const* expected_elements = expected.elements();
+    const complex<float>* const* actual_elements = actual.elements();
+    for (int i = 0; i < expected.num_rows(); ++i) {
+      for (int j = 0; j < expected.num_columns(); ++j) {
+        EXPECT_NEAR(expected_elements[i][j].real(),
+                    actual_elements[i][j].real(),
+                    tolerance);
+        EXPECT_NEAR(expected_elements[i][j].imag(),
+                    actual_elements[i][j].imag(),
+                    tolerance);
+      }
+    }
+  }
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_MATRIX_TEST_HELPERS_H_