Configure VoE NACK through AudioSendStream::Config.

webrtc/test/mock_voe_channel_proxy.h

Index: webrtc/test/mock_voe_channel_proxy.h
diff --git a/webrtc/test/mock_voe_channel_proxy.h b/webrtc/test/mock_voe_channel_proxy.h
index a27a739006edfaffb9aff16f23abf87872cb571d..1e9c54f2e8cace711fc2f76a399b026143f89ed9 100644
--- a/webrtc/test/mock_voe_channel_proxy.h
+++ b/webrtc/test/mock_voe_channel_proxy.h
@@ -23,6 +23,7 @@ class MockVoEChannelProxy : public voe::ChannelProxy {
   MOCK_METHOD1(SetRTCPStatus, void(bool enable));
   MOCK_METHOD1(SetLocalSSRC, void(uint32_t ssrc));
   MOCK_METHOD1(SetRTCP_CNAME, void(const std::string& c_name));
+  MOCK_METHOD2(SetNACKStatus, void(bool enable, int max_packets));
   MOCK_METHOD2(SetSendAbsoluteSenderTimeStatus, void(bool enable, int id));
   MOCK_METHOD2(SetSendAudioLevelIndicationStatus, void(bool enable, int id));
   MOCK_METHOD2(SetReceiveAbsoluteSenderTimeStatus, void(bool enable, int id));