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diff --git a/src/modules/audio_processing/main/source/echo_cancellation_impl.h b/src/modules/audio_processing/main/source/echo_cancellation_impl.h
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+++ b/src/modules/audio_processing/main/source/echo_cancellation_impl.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2011 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 WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_ECHO_CANCELLATION_IMPL_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_ECHO_CANCELLATION_IMPL_H_
+
+#include "audio_processing.h"
+#include "processing_component.h"
+
+namespace webrtc {
+class AudioProcessingImpl;
+class AudioBuffer;
+
+class EchoCancellationImpl : public EchoCancellation,
+                             public ProcessingComponent {
+ public:
+  explicit EchoCancellationImpl(const AudioProcessingImpl* apm);
+  virtual ~EchoCancellationImpl();
+
+  int ProcessRenderAudio(const AudioBuffer* audio);
+  int ProcessCaptureAudio(AudioBuffer* audio);
+
+  // EchoCancellation implementation.
+  virtual bool is_enabled() const;
+
+  // ProcessingComponent implementation.
+  virtual int Initialize();
+  virtual int get_version(char* version, int version_len_bytes) const;
+
+ private:
+  // EchoCancellation implementation.
+  virtual int Enable(bool enable);
+  virtual int enable_drift_compensation(bool enable);
+  virtual bool is_drift_compensation_enabled() const;
+  virtual int set_device_sample_rate_hz(int rate);
+  virtual int device_sample_rate_hz() const;
+  virtual int set_stream_drift_samples(int drift);
+  virtual int stream_drift_samples() const;
+  virtual int set_suppression_level(SuppressionLevel level);
+  virtual SuppressionLevel suppression_level() const;
+  virtual int enable_metrics(bool enable);
+  virtual bool are_metrics_enabled() const;
+  virtual bool stream_has_echo() const;
+  virtual int GetMetrics(Metrics* metrics);
+
+  // ProcessingComponent implementation.
+  virtual void* CreateHandle() const;
+  virtual int InitializeHandle(void* handle) const;
+  virtual int ConfigureHandle(void* handle) const;
+  virtual int DestroyHandle(void* handle) const;
+  virtual int num_handles_required() const;
+  virtual int GetHandleError(void* handle) const;
+
+  const AudioProcessingImpl* apm_;
+  bool drift_compensation_enabled_;
+  bool metrics_enabled_;
+  SuppressionLevel suppression_level_;
+  int device_sample_rate_hz_;
+  int stream_drift_samples_;
+  bool was_stream_drift_set_;
+  bool stream_has_echo_;
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_ECHO_CANCELLATION_IMPL_H_