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/reverb_model_estimator.cc

@@ -0,0 +1,54 @@
+/*
+ *  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/reverb_model_estimator.h"
+
+namespace webrtc {
+
+ReverbModelEstimator::ReverbModelEstimator(const EchoCanceller3Config& config,
+                                           size_t num_capture_channels)
+    : reverb_decay_estimators_(num_capture_channels),
+      reverb_frequency_responses_(num_capture_channels) {
+  for (size_t ch = 0; ch < reverb_decay_estimators_.size(); ++ch) {
+    reverb_decay_estimators_[ch] =
+        std::make_unique<ReverbDecayEstimator>(config);
+  }
+}
+
+ReverbModelEstimator::~ReverbModelEstimator() = default;
+
+void ReverbModelEstimator::Update(
+    rtc::ArrayView<const std::vector<float>> impulse_responses,
+    rtc::ArrayView<const std::vector<std::array<float, kFftLengthBy2Plus1>>>
+        frequency_responses,
+    rtc::ArrayView<const absl::optional<float>> linear_filter_qualities,
+    rtc::ArrayView<const int> filter_delays_blocks,
+    const std::vector<bool>& usable_linear_estimates,
+    bool stationary_block) {
+  const size_t num_capture_channels = reverb_decay_estimators_.size();
+  RTC_DCHECK_EQ(num_capture_channels, impulse_responses.size());
+  RTC_DCHECK_EQ(num_capture_channels, frequency_responses.size());
+  RTC_DCHECK_EQ(num_capture_channels, usable_linear_estimates.size());
+
+  for (size_t ch = 0; ch < num_capture_channels; ++ch) {
+    // Estimate the frequency response for the reverb.
+    reverb_frequency_responses_[ch].Update(
+        frequency_responses[ch], filter_delays_blocks[ch],
+        linear_filter_qualities[ch], stationary_block);
+
+    // Estimate the reverb decay,
+    reverb_decay_estimators_[ch]->Update(
+        impulse_responses[ch], linear_filter_qualities[ch],
+        filter_delays_blocks[ch], usable_linear_estimates[ch],
+        stationary_block);
+  }
+}
+
+}  // namespace webrtc