Update to current webrtc library

This is from the upstream library commit id
3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium
88.0.4290.1.

webrtc/modules/audio_processing/aec3/subtractor_output.cc

@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2018 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 "modules/audio_processing/aec3/subtractor_output.h"
+
+#include <numeric>
+
+namespace webrtc {
+
+SubtractorOutput::SubtractorOutput() = default;
+SubtractorOutput::~SubtractorOutput() = default;
+
+void SubtractorOutput::Reset() {
+  s_refined.fill(0.f);
+  s_coarse.fill(0.f);
+  e_refined.fill(0.f);
+  e_coarse.fill(0.f);
+  E_refined.re.fill(0.f);
+  E_refined.im.fill(0.f);
+  E2_refined.fill(0.f);
+  E2_coarse.fill(0.f);
+  e2_refined = 0.f;
+  e2_coarse = 0.f;
+  s2_refined = 0.f;
+  s2_coarse = 0.f;
+  y2 = 0.f;
+}
+
+void SubtractorOutput::ComputeMetrics(rtc::ArrayView<const float> y) {
+  const auto sum_of_squares = [](float a, float b) { return a + b * b; };
+  y2 = std::accumulate(y.begin(), y.end(), 0.f, sum_of_squares);
+  e2_refined =
+      std::accumulate(e_refined.begin(), e_refined.end(), 0.f, sum_of_squares);
+  e2_coarse =
+      std::accumulate(e_coarse.begin(), e_coarse.end(), 0.f, sum_of_squares);
+  s2_refined =
+      std::accumulate(s_refined.begin(), s_refined.end(), 0.f, sum_of_squares);
+  s2_coarse =
+      std::accumulate(s_coarse.begin(), s_coarse.end(), 0.f, sum_of_squares);
+
+  s_refined_max_abs = *std::max_element(s_refined.begin(), s_refined.end());
+  s_refined_max_abs =
+      std::max(s_refined_max_abs,
+               -(*std::min_element(s_refined.begin(), s_refined.end())));
+
+  s_coarse_max_abs = *std::max_element(s_coarse.begin(), s_coarse.end());
+  s_coarse_max_abs = std::max(
+      s_coarse_max_abs, -(*std::min_element(s_coarse.begin(), s_coarse.end())));
+}
+
+}  // namespace webrtc