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diff --git a/chromium/third_party/blink/renderer/platform/audio/audio_resampler.h b/chromium/third_party/blink/renderer/platform/audio/audio_resampler.h
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+/*
+ * Copyright (C) 2010, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_
+
+#include <memory>
+#include "third_party/blink/renderer/platform/audio/audio_bus.h"
+#include "third_party/blink/renderer/platform/audio/audio_resampler_kernel.h"
+#include "third_party/blink/renderer/platform/audio/audio_source_provider.h"
+#include "third_party/blink/renderer/platform/wtf/allocator.h"
+#include "third_party/blink/renderer/platform/wtf/noncopyable.h"
+#include "third_party/blink/renderer/platform/wtf/vector.h"
+
+namespace blink {
+
+// AudioResampler resamples the audio stream from an AudioSourceProvider.
+// The audio stream may be single or multi-channel.
+// The default constructor defaults to single-channel (mono).
+
+class PLATFORM_EXPORT AudioResampler {
+  DISALLOW_NEW();
+  WTF_MAKE_NONCOPYABLE(AudioResampler);
+
+ public:
+  AudioResampler();
+  AudioResampler(unsigned number_of_channels);
+  ~AudioResampler() = default;
+
+  // Given an AudioSourceProvider, process() resamples the source stream into
+  // destinationBus.
+  void Process(AudioSourceProvider*,
+               AudioBus* destination_bus,
+               size_t frames_to_process);
+
+  // Resets the processing state.
+  void Reset();
+
+  void ConfigureChannels(unsigned number_of_channels);
+
+  // 0 < rate <= MaxRate
+  void SetRate(double rate);
+  double Rate() const { return rate_; }
+
+  static const double kMaxRate;
+
+ private:
+  double rate_;
+  Vector<std::unique_ptr<AudioResamplerKernel>> kernels_;
+  scoped_refptr<AudioBus> source_bus_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_RESAMPLER_H_