Adding two new stats to VoiceReceiverInfo

There have been requests of two new stats namely

speech_expand_rate and secondary_decoded_rate.

BUG=3867
R=henrik.lundin@webrtc.org, henrika@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/40789004

Cr-Commit-Position: refs/heads/master@{#8415}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8415 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/media/base/mediachannel.h b/talk/media/base/mediachannel.h
index ce8aaac..19cb9a3 100644
--- a/talk/media/base/mediachannel.h
+++ b/talk/media/base/mediachannel.h
@@ -779,6 +779,8 @@
         delay_estimate_ms(0),
         audio_level(0),
         expand_rate(0),
+        speech_expand_rate(0),
+        secondary_decoded_rate(0),
         decoding_calls_to_silence_generator(0),
         decoding_calls_to_neteq(0),
         decoding_normal(0),
@@ -794,8 +796,12 @@
   int jitter_buffer_preferred_ms;
   int delay_estimate_ms;
   int audio_level;
-  // fraction of synthesized speech inserted through pre-emptive expansion
+  // fraction of synthesized audio inserted through expansion.
   float expand_rate;
+  // fraction of synthesized speech inserted through expansion.
+  float speech_expand_rate;
+  // fraction of data out of secondary decoding, including FEC and RED.
+  float secondary_decoded_rate;
   int decoding_calls_to_silence_generator;
   int decoding_calls_to_neteq;
   int decoding_normal;