Adding second layer of the echo canceller 3 functionality.

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

+/*
+ *  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_RENDER_DELAY_CONTROLLER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_RENDER_DELAY_CONTROLLER_H_
+
+#include "webrtc/base/array_view.h"
+#include "webrtc/base/optional.h"
+#include "webrtc/modules/audio_processing/aec3/render_delay_controller.h"
+#include "webrtc/test/gmock.h"
+
+namespace webrtc {
+namespace test {
+
+class MockRenderDelayController : public RenderDelayController {
+ public:
+  virtual ~MockRenderDelayController() = default;
+
+  MOCK_METHOD1(GetDelay, size_t(rtc::ArrayView<const float> capture));
+  MOCK_METHOD1(AnalyzeRender, bool(rtc::ArrayView<const float> capture));
+  MOCK_CONST_METHOD0(AlignmentHeadroomSamples, rtc::Optional<size_t>());
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_RENDER_DELAY_CONTROLLER_H_