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/delay_estimate.h

@@ -0,0 +1,31 @@
+/*
+ *  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_DELAY_ESTIMATE_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_DELAY_ESTIMATE_H_
+
+namespace webrtc {
+
+// Stores delay_estimates.
+struct DelayEstimate {
+  enum class Quality { kCoarse, kRefined };
+
+  DelayEstimate(Quality quality, size_t delay)
+      : quality(quality), delay(delay) {}
+
+  Quality quality;
+  size_t delay;
+  size_t blocks_since_last_change = 0;
+  size_t blocks_since_last_update = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_DELAY_ESTIMATE_H_