Add AudioEncoder::GetTargetBitrate

webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h

Index: webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h
diff --git a/webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h b/webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h
index f1e1c51da8d724e119e21ab2b4e260a73736ecca..2058a1d91b4654b92b9819651222401095a92f85 100644
--- a/webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h
+++ b/webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h
@@ -17,7 +17,7 @@
 
 namespace webrtc {
 
-class AudioEncoderPcm16B : public AudioEncoderPcm {
+class AudioEncoderPcm16B final : public AudioEncoderPcm {
  public:
   struct Config : public AudioEncoderPcm::Config {
    public:
@@ -30,6 +30,8 @@ class AudioEncoderPcm16B : public AudioEncoderPcm {
   explicit AudioEncoderPcm16B(const Config& config)
       : AudioEncoderPcm(config, config.sample_rate_hz) {}
 
+  int SetTargetBitrate(int bits_per_second) override;
+
  protected:
   int16_t EncodeCall(const int16_t* audio,
                      size_t input_len,