Implement AudioReceiveStream::GetStats().

webrtc/voice_engine/voice_engine_impl.h

Index: webrtc/voice_engine/voice_engine_impl.h
diff --git a/webrtc/voice_engine/voice_engine_impl.h b/webrtc/voice_engine/voice_engine_impl.h
index 07f29c37b9aa177323ea88d154d16673e32a204e..21039943fd29d472f97c52283ba399ddc2ed9770 100644
--- a/webrtc/voice_engine/voice_engine_impl.h
+++ b/webrtc/voice_engine/voice_engine_impl.h
@@ -128,8 +128,11 @@ class VoiceEngineImpl : public voe::SharedData,  // Must be the first base class
   // This implements the Release() method for all the inherited interfaces.
   int Release() override;
 
- private:
+ // This is *protected* so that FakeVoiceEngine can inherit from the class and
+ // manipulate the reference count. See: fake_voice_engine.h.
+ protected:
   Atomic32 _ref_count;
+ private:
   rtc::scoped_ptr<const Config> own_config_;
 };