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diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/block_processor.h b/third_party/libwebrtc/modules/audio_processing/aec3/block_processor.h
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+/*
+ *  Copyright (c) 2016 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_BLOCK_PROCESSOR_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_BLOCK_PROCESSOR_H_
+
+#include <stddef.h>
+
+#include <memory>
+#include <vector>
+
+#include "api/audio/echo_canceller3_config.h"
+#include "api/audio/echo_control.h"
+#include "modules/audio_processing/aec3/block.h"
+#include "modules/audio_processing/aec3/echo_remover.h"
+#include "modules/audio_processing/aec3/render_delay_buffer.h"
+#include "modules/audio_processing/aec3/render_delay_controller.h"
+
+namespace webrtc {
+
+// Class for performing echo cancellation on 64 sample blocks of audio data.
+class BlockProcessor {
+ public:
+  static BlockProcessor* Create(const EchoCanceller3Config& config,
+                                int sample_rate_hz,
+                                size_t num_render_channels,
+                                size_t num_capture_channels);
+  // Only used for testing purposes.
+  static BlockProcessor* Create(
+      const EchoCanceller3Config& config,
+      int sample_rate_hz,
+      size_t num_render_channels,
+      size_t num_capture_channels,
+      std::unique_ptr<RenderDelayBuffer> render_buffer);
+  static BlockProcessor* Create(
+      const EchoCanceller3Config& config,
+      int sample_rate_hz,
+      size_t num_render_channels,
+      size_t num_capture_channels,
+      std::unique_ptr<RenderDelayBuffer> render_buffer,
+      std::unique_ptr<RenderDelayController> delay_controller,
+      std::unique_ptr<EchoRemover> echo_remover);
+
+  virtual ~BlockProcessor() = default;
+
+  // Get current metrics.
+  virtual void GetMetrics(EchoControl::Metrics* metrics) const = 0;
+
+  // Provides an optional external estimate of the audio buffer delay.
+  virtual void SetAudioBufferDelay(int delay_ms) = 0;
+
+  // Processes a block of capture data.
+  virtual void ProcessCapture(bool echo_path_gain_change,
+                              bool capture_signal_saturation,
+                              Block* linear_output,
+                              Block* capture_block) = 0;
+
+  // Buffers a block of render data supplied by a FrameBlocker object.
+  virtual void BufferRender(const Block& render_block) = 0;
+
+  // Reports whether echo leakage has been detected in the echo canceller
+  // output.
+  virtual void UpdateEchoLeakageStatus(bool leakage_detected) = 0;
+
+  // Specifies whether the capture output will be used. The purpose of this is
+  // to allow the block processor to deactivate some of the processing when the
+  // resulting output is anyway not used, for instance when the endpoint is
+  // muted.
+  virtual void SetCaptureOutputUsage(bool capture_output_used) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_BLOCK_PROCESSOR_H_