Change TWCC send interval to reduce overhead on low BW situations.

webrtc/base/ratetracker.h

Index: webrtc/base/ratetracker.h
diff --git a/webrtc/base/ratetracker.h b/webrtc/base/ratetracker.h
index 6ae9bec119d23552c6f967416ad897af81741ffa..9d86b6ad668193fe2288544eea87333ce0bb81d7 100644
--- a/webrtc/base/ratetracker.h
+++ b/webrtc/base/ratetracker.h
@@ -27,25 +27,22 @@ class RateTracker {
   // Computes the average rate over the most recent interval_milliseconds,
   // or if the first sample was added within this period, computes the rate
   // since the first sample was added.
-  double ComputeRateForInterval(int64_t interval_milliseconds) const;
+  virtual double ComputeRateForInterval(int64_t interval_milliseconds) const;
 
   // Computes the average rate over the rate tracker's recording interval
   // of bucket_milliseconds * bucket_count.
-  double ComputeRate() const {
-    return ComputeRateForInterval(bucket_milliseconds_ *
-                                  static_cast<int64_t>(bucket_count_));
-  }
+  virtual double ComputeRate() const;
 
   // Computes the average rate since the first sample was added to the
   // rate tracker.
-  double ComputeTotalRate() const;
+  virtual double ComputeTotalRate() const;
 
   // The total number of samples added.
-  size_t TotalSampleCount() const;
+  virtual size_t TotalSampleCount() const;
 
   // Reads the current time in order to determine the appropriate bucket for
   // these samples, and increments the count for that bucket by sample_count.
-  void AddSamples(size_t sample_count);
+  virtual void AddSamples(size_t sample_count);
 
  protected:
   // overrideable for tests