Adding second layer of the echo canceller 3 functionality.

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

Index: webrtc/modules/audio_processing/aec3/mock/mock_render_delay_buffer.h
diff --git a/webrtc/modules/audio_processing/aec3/mock/mock_render_delay_buffer.h b/webrtc/modules/audio_processing/aec3/mock/mock_render_delay_buffer.h
new file mode 100644
index 0000000000000000000000000000000000000000..3b17dbe2fea25363504f4bb62c05ded1085655f6
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+++ b/webrtc/modules/audio_processing/aec3/mock/mock_render_delay_buffer.h
@@ -0,0 +1,51 @@
+/*
+ *  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_BUFFER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_RENDER_DELAY_BUFFER_H_
+
+#include <vector>
+
+#include "webrtc/modules/audio_processing/aec3/aec3_constants.h"
+#include "webrtc/modules/audio_processing/aec3/render_delay_buffer.h"
+#include "webrtc/test/gmock.h"
+
+namespace webrtc {
+namespace test {
+
+class MockRenderDelayBuffer : public RenderDelayBuffer {
+ public:
+  explicit MockRenderDelayBuffer(int sample_rate_hz)
+      : block_(std::vector<std::vector<float>>(
+            NumBandsForRate(sample_rate_hz),
+            std::vector<float>(kBlockSize, 0.f))) {
+    ON_CALL(*this, GetNext())
+        .WillByDefault(
+            testing::Invoke(this, &MockRenderDelayBuffer::FakeGetNext));
+  }
+  virtual ~MockRenderDelayBuffer() = default;
+
+  MOCK_METHOD1(Insert, bool(std::vector<std::vector<float>>* block));
+  MOCK_METHOD0(GetNext, const std::vector<std::vector<float>>&());
+  MOCK_METHOD1(SetDelay, void(size_t delay));
+  MOCK_CONST_METHOD0(Delay, size_t());
+  MOCK_CONST_METHOD0(MaxDelay, size_t());
+  MOCK_CONST_METHOD0(IsBlockAvailable, bool());
+  MOCK_CONST_METHOD0(MaxApiJitter, size_t());
+
+ private:
+  const std::vector<std::vector<float>>& FakeGetNext() const { return block_; }
+  std::vector<std::vector<float>> block_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_RENDER_DELAY_BUFFER_H_