Allow an external audio processing module to be used in WebRTC

webrtc/voice_engine/voice_engine_fixture.cc

Index: webrtc/voice_engine/voice_engine_fixture.cc
diff --git a/webrtc/voice_engine/voice_engine_fixture.cc b/webrtc/voice_engine/voice_engine_fixture.cc
index faac8dd48c254af46ddc30f1638fb2da16d9fb0c..aaa72210fa49fea2c39cc888b8e4f4eb5d62401e 100644
--- a/webrtc/voice_engine/voice_engine_fixture.cc
+++ b/webrtc/voice_engine/voice_engine_fixture.cc
@@ -1,4 +1,4 @@
-/*
+ /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
@@ -9,6 +9,7 @@
  */
 
 #include "webrtc/voice_engine/voice_engine_fixture.h"
+#include "webrtc/modules/audio_processing/include/mock_audio_processing.h"
 
 namespace webrtc {
 
@@ -19,6 +20,7 @@ VoiceEngineFixture::VoiceEngineFixture()
   EXPECT_NE(nullptr, base_);
   EXPECT_NE(nullptr, network_);
   EXPECT_EQ(0, base_->RegisterVoiceEngineObserver(observer_));
+  apm_ = new rtc::RefCountedObject<test::MockAudioProcessing>();
 }
 
 VoiceEngineFixture::~VoiceEngineFixture() {