Add AudioEncoder::GetTargetBitrate

webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc

Index: webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc
diff --git a/webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc b/webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc
index 8e10dffe8e88ed5e7100b9eb350338db7015a9a0..a0d1720e460f9c90231ca583f9d001df6e8cc826 100644
--- a/webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc
+++ b/webrtc/modules/audio_coding/codecs/g722/audio_encoder_g722.cc
@@ -82,6 +82,11 @@ int AudioEncoderG722::Max10MsFramesInAPacket() const {
   return num_10ms_frames_per_packet_;
 }
 
+int AudioEncoderG722::GetTargetBitrate() const {
+  // 4 bits/sample, 16000 samples/s/channel.
+  return 64000 * NumChannels();
+}
+
 AudioEncoder::EncodedInfo AudioEncoderG722::EncodeInternal(
     uint32_t rtp_timestamp,
     const int16_t* audio,