Add AudioEncoder::GetTargetBitrate

webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h

Index: webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h
diff --git a/webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h b/webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h
index 870b4ddfb6f16c7e70db8d479194dcdecb088f1b..05a8df10f18f8441f5c1e574956a8533b2ae972b 100644
--- a/webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h
+++ b/webrtc/modules/audio_coding/codecs/g711/include/audio_encoder_pcm.h
@@ -41,6 +41,7 @@ class AudioEncoderPcm : public AudioEncoder {
   size_t MaxEncodedBytes() const override;
   int Num10MsFramesInNextPacket() const override;
   int Max10MsFramesInAPacket() const override;
+  int SetTargetBitrate(int bits_per_second) override;
   EncodedInfo EncodeInternal(uint32_t rtp_timestamp,
                              const int16_t* audio,
                              size_t max_encoded_bytes,
@@ -63,7 +64,7 @@ class AudioEncoderPcm : public AudioEncoder {
   uint32_t first_timestamp_in_buffer_;
 };
 
-class AudioEncoderPcmA : public AudioEncoderPcm {
+class AudioEncoderPcmA final : public AudioEncoderPcm {
  public:
   struct Config : public AudioEncoderPcm::Config {
     Config() : AudioEncoderPcm::Config(8) {}
@@ -81,7 +82,7 @@ class AudioEncoderPcmA : public AudioEncoderPcm {
   static const int kSampleRateHz = 8000;
 };
 
-class AudioEncoderPcmU : public AudioEncoderPcm {
+class AudioEncoderPcmU final : public AudioEncoderPcm {
  public:
   struct Config : public AudioEncoderPcm::Config {
     Config() : AudioEncoderPcm::Config(0) {}