Add AudioEncoder::GetTargetBitrate

webrtc/modules/audio_coding/codecs/audio_encoder.h

Index: webrtc/modules/audio_coding/codecs/audio_encoder.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_encoder.h b/webrtc/modules/audio_coding/codecs/audio_encoder.h
index 9025834dfa78704d16f00aed0b5bfe091eda86d7..fe6fd87dfd791b53247bd26cc59fbd73a08f3187 100644
--- a/webrtc/modules/audio_coding/codecs/audio_encoder.h
+++ b/webrtc/modules/audio_coding/codecs/audio_encoder.h
@@ -96,6 +96,11 @@ class AudioEncoder {
   // Num10MsFramesInNextPacket().
   virtual int Max10MsFramesInAPacket() const = 0;
 
+  // Returns the current target bitrate in bits/s. The value -1 means that the
+  // codec adapts the target automatically, and a current target cannot be
+  // provided.
+  virtual int GetTargetBitrate() const = 0;
+
   // Changes the target bitrate. The implementation is free to alter this value,
   // e.g., if the desired value is outside the valid range.
   virtual void SetTargetBitrate(int bits_per_second) {}