Added first layer of the echo canceller 3 functionality

webrtc/modules/audio_processing/aec3/block_processor.h

Index: webrtc/modules/audio_processing/aec3/block_processor.h
diff --git a/webrtc/modules/audio_processing/aec3/block_processor.h b/webrtc/modules/audio_processing/aec3/block_processor.h
new file mode 100644
index 0000000000000000000000000000000000000000..b84b18df81a24fe1cf7ec6329189a7d67001f04b
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+++ b/webrtc/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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_BLOCK_PROCESSOR_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_BLOCK_PROCESSOR_H_
+
+#include <memory>
+#include <vector>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_processing/logging/apm_data_dumper.h"
+
+namespace webrtc {
+
+// Class for performing echo cancellation on 64 sample blocks of audio data.
+class BlockProcessor {
+ public:
+  static BlockProcessor* Create(int sample_rate_hz);
+  virtual ~BlockProcessor() = default;
+
+  // Processes a block of capture data.
+  virtual void ProcessCapture(
+      bool known_echo_path_change,
+      bool saturated_microphone_signal,
+      std::vector<std::vector<float>>* capture_block) = 0;
+
+  // Buffers a block of render data supplied by a FrameBlocker object.
+  virtual bool BufferRender(std::vector<std::vector<float>>* render_block) = 0;
+
+  // Reports whether echo leakage has been detected in the echo canceller
+  // output.
+  virtual void ReportEchoLeakage(bool leakage_detected) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_BLOCK_PROCESSOR_H_