Add AudioEncoder::GetTargetBitrate

webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h

Index: webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h
diff --git a/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h b/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h
index befb3558beb85ff8eb304fae5317bbe6f19cde52..e88720dde7f9b7b246002728313702ea40a69b32 100644
--- a/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h
+++ b/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h
@@ -77,10 +77,12 @@ AudioEncoderDecoderIsacT<T>::AudioEncoderDecoderIsacT(const Config& config)
   CHECK_EQ(0, T::SetEncSampRate(isac_state_, config.sample_rate_hz));
   const int bit_rate = config.bit_rate == 0 ? kDefaultBitRate : config.bit_rate;
   if (config.adaptive_mode) {
+    target_bitrate_bps_ = -1;
     CHECK_EQ(0, T::ControlBwe(isac_state_, bit_rate,
                               config.frame_size_ms, config.enforce_frame_size));
 
   } else {
+    target_bitrate_bps_ = bit_rate;
     CHECK_EQ(0, T::Control(isac_state_, bit_rate, config.frame_size_ms));
   }
   // When config.sample_rate_hz is set to 48000 Hz (iSAC-fb), the decoder is
@@ -130,6 +132,12 @@ int AudioEncoderDecoderIsacT<T>::Max10MsFramesInAPacket() const {
 }
 
 template <typename T>
+int AudioEncoderDecoderIsacT<T>::GetTargetBitrate() const {
+  CriticalSectionScoped cs_lock(lock_.get());
+  return target_bitrate_bps_;
+}
+
+template <typename T>
 AudioEncoder::EncodedInfo AudioEncoderDecoderIsacT<T>::EncodeInternal(
     uint32_t rtp_timestamp,
     const int16_t* audio,