Adding second layer of the echo canceller 3 functionality.

webrtc/modules/audio_processing/aec3/mock/mock_echo_remover.h

Index: webrtc/modules/audio_processing/aec3/mock/mock_echo_remover.h
diff --git a/webrtc/modules/audio_processing/aec3/mock/mock_echo_remover.h b/webrtc/modules/audio_processing/aec3/mock/mock_echo_remover.h
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index 0000000000000000000000000000000000000000..6cde439ed6f8b3ab4edceaf3e649ec1c4deebdd6
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+++ b/webrtc/modules/audio_processing/aec3/mock/mock_echo_remover.h
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2017 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_MOCK_MOCK_ECHO_REMOVER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_ECHO_REMOVER_H_
+
+#include <vector>
+
+#include "webrtc/base/optional.h"
+#include "webrtc/modules/audio_processing/aec3/echo_path_variability.h"
+#include "webrtc/modules/audio_processing/aec3/echo_remover.h"
+#include "webrtc/test/gmock.h"
+
+namespace webrtc {
+namespace test {
+
+class MockEchoRemover : public EchoRemover {
+ public:
+  virtual ~MockEchoRemover() = default;
+
+  MOCK_METHOD5(ProcessBlock,
+               void(const rtc::Optional<size_t>& echo_path_delay_samples,
+                    const EchoPathVariability& echo_path_variability,
+                    bool capture_signal_saturation,
+                    const std::vector<std::vector<float>>& render,
+                    std::vector<std::vector<float>>* capture));
+
+  MOCK_METHOD1(UpdateEchoLeakageStatus, void(bool leakage_detected));
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_ECHO_REMOVER_H_