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/agc2/vector_float_frame.h

@@ -0,0 +1,42 @@
+/*
+ *  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_AGC2_VECTOR_FLOAT_FRAME_H_
+#define MODULES_AUDIO_PROCESSING_AGC2_VECTOR_FLOAT_FRAME_H_
+
+#include <vector>
+
+#include "modules/audio_processing/include/audio_frame_view.h"
+
+namespace webrtc {
+
+// A construct consisting of a multi-channel audio frame, and a FloatFrame view
+// of it.
+class VectorFloatFrame {
+ public:
+  VectorFloatFrame(int num_channels,
+                   int samples_per_channel,
+                   float start_value);
+  const AudioFrameView<float>& float_frame_view() { return float_frame_view_; }
+  AudioFrameView<const float> float_frame_view() const {
+    return float_frame_view_;
+  }
+
+  ~VectorFloatFrame();
+
+ private:
+  std::vector<std::vector<float>> channels_;
+  std::vector<float*> channel_ptrs_;
+  AudioFrameView<float> float_frame_view_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AGC2_VECTOR_FLOAT_FRAME_H_