Make a the decisions of ANA optional for the opus encoder.

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
index e8bfaf6830cca7dff72f7ef749b9b46ad8173634..01769e1ac31131f518eb953c2fc31936abda29e6 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
@@ -443,4 +443,19 @@ TEST(AudioEncoderOpusTest, ConfigComplexityAdaptation) {
   config.bitrate_bps = rtc::Optional<int>(14001);
   EXPECT_EQ(rtc::Optional<int>(6), config.GetNewComplexity());
 }
+
+TEST(AudioEncoderOpusTest, ApplyAudioNetworkAdaptorCanHandlerNotDefinedEntrys) {

[minyue-webrtc, 2016/12/22 14:11:26]

Handler -> Handle

NotDefined -> Empty

Entrys -> Entries

+  auto states = CreateCodec(2);
+  states.encoder->EnableAudioNetworkAdaptor("", nullptr);
+
+  AudioNetworkAdaptor::EncoderRuntimeConfig config;
+  EXPECT_CALL(**states.mock_audio_network_adaptor, GetEncoderRuntimeConfig())
+      .WillOnce(Return(config));
+
+  // Donne to force a call of ApplyAudioNetworkAdaptor.

[minyue-webrtc, 2016/12/22 14:11:26]

I suggest remove this comment.

+  constexpr size_t kOverhead = 64;
+  EXPECT_CALL(**states.mock_audio_network_adaptor, SetOverhead(kOverhead));
+  states.encoder->OnReceivedOverhead(kOverhead);
+}
+
 }  // namespace webrtc