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/clockdrift_detector.h

@@ -0,0 +1,40 @@
+/*
+ *  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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_
+
+#include <stddef.h>
+
+#include <array>
+
+namespace webrtc {
+
+class ApmDataDumper;
+struct DownsampledRenderBuffer;
+struct EchoCanceller3Config;
+
+// Detects clockdrift by analyzing the estimated delay.
+class ClockdriftDetector {
+ public:
+  enum class Level { kNone, kProbable, kVerified, kNumCategories };
+  ClockdriftDetector();
+  ~ClockdriftDetector();
+  void Update(int delay_estimate);
+  Level ClockdriftLevel() const { return level_; }
+
+ private:
+  std::array<int, 3> delay_history_;
+  Level level_;
+  size_t stability_counter_;
+};
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_CLOCKDRIFT_DETECTOR_H_