NetEq: Fix a bug in expand_rate and speech_expand_rate calculation

webrtc/modules/audio_coding/neteq/statistics_calculator.h

Index: webrtc/modules/audio_coding/neteq/statistics_calculator.h
diff --git a/webrtc/modules/audio_coding/neteq/statistics_calculator.h b/webrtc/modules/audio_coding/neteq/statistics_calculator.h
index b2df865f632150cf9c227201867564fb5caa15c8..fb869ab025be5efa47c22aa2ac6f4a7bcb709655 100644
--- a/webrtc/modules/audio_coding/neteq/statistics_calculator.h
+++ b/webrtc/modules/audio_coding/neteq/statistics_calculator.h
@@ -45,6 +45,14 @@ class StatisticsCalculator {
   // that the expansion produced only noise samples.
   void ExpandedNoiseSamples(size_t num_samples);
 
+  // Corrects the statistics for number of samples produced through non-noise
+  // expansion by adding |num_samples| (negative or positive) to the current
+  // value. The result is capped to zero to avoid negative values.
+  void ExpandedVoiceSamplesCorrection(int num_samples);
+
+  // Same as ExpandedVoiceSamplesCorrection but for noise samples.
+  void ExpandedNoiseSamplesCorrection(int num_samples);
+
   // Reports that |num_samples| samples were produced through preemptive
   // expansion.
   void PreemptiveExpandedSamples(size_t num_samples);