RTCIceCandidatePairStats.available[Outgoing/Incoming]Bitrate collected.

webrtc/api/stats/rtcstats.h

Index: webrtc/api/stats/rtcstats.h
diff --git a/webrtc/api/stats/rtcstats.h b/webrtc/api/stats/rtcstats.h
index b3afee069561f01e5a4e041cbd4650f460481080..ae4afec017bb9813e343904efa35f56ddb4c0374 100644
--- a/webrtc/api/stats/rtcstats.h
+++ b/webrtc/api/stats/rtcstats.h
@@ -60,6 +60,9 @@ class RTCStats {
   const std::string& id() const { return id_; }
   // Time relative to the UNIX epoch (Jan 1, 1970, UTC), in microseconds.
   int64_t timestamp_us() const { return timestamp_us_; }
+  void set_timestamp_us_for_testing(int64_t timestamp_us) {
+    timestamp_us_ = timestamp_us;
+  }
   // Returns the static member variable |kType| of the implementing class.
   virtual const char* type() const = 0;
   // Returns a vector of pointers to all the |RTCStatsMemberInterface| members