Major AEC3 render pipeline changes

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

 /*
  *  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_MOCK_MOCK_BLOCK_PROCESSOR_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_BLOCK_PROCESSOR_H_
 
 #include <vector>
 
 #include "webrtc/modules/audio_processing/aec3/block_processor.h"
 #include "webrtc/test/gmock.h"
 
 namespace webrtc {
 namespace test {
 
 class MockBlockProcessor : public BlockProcessor {
  public:
   virtual ~MockBlockProcessor() {}
 
   MOCK_METHOD3(ProcessCapture,
                void(bool level_change,
                     bool saturated_microphone_signal,
                     std::vector<std::vector<float>>* capture_block));
-  MOCK_METHOD1(BufferRender, bool(std::vector<std::vector<float>>* block));
+  MOCK_METHOD1(BufferRender,
+               void(const std::vector<std::vector<float>>& block));
   MOCK_METHOD1(UpdateEchoLeakageStatus, void(bool leakage_detected));
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_MOCK_MOCK_BLOCK_PROCESSOR_H_