Add AudioEncoder::GetTargetBitrate

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

Index: webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t.h
diff --git a/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t.h b/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t.h
index b67a9b09fcf10892706ff2b69dbe985d98188a67..0aff60d28d48d92cdafdaf5199dcdf4e632598bd 100644
--- a/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t.h
+++ b/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t.h
@@ -59,6 +59,7 @@ class AudioEncoderDecoderIsacT : public AudioEncoder, public AudioDecoder {
   size_t MaxEncodedBytes() const override;
   int Num10MsFramesInNextPacket() const override;
   int Max10MsFramesInAPacket() const override;
+  int SetTargetBitrate(int bits_per_second) override;
 
   // AudioDecoder methods.
   bool HasDecodePlc() const override;
@@ -113,6 +114,8 @@ class AudioEncoderDecoderIsacT : public AudioEncoder, public AudioDecoder {
   // Timestamp of the previously encoded packet.
   uint32_t last_encoded_timestamp_ GUARDED_BY(lock_);
 
+  int target_bitrate_bps_ GUARDED_BY(lock_);
+
   DISALLOW_COPY_AND_ASSIGN(AudioEncoderDecoderIsacT);
 };