ReceiveStatisticsProxy: add some unit tests, change members from int to int64_t.

webrtc/video/receive_statistics_proxy.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 67 matching lines @@
       uint32_t ssrc,
       const RtcpPacketTypeCounter& packet_counter) override;
   // Overrides StreamDataCountersCallback.
   void DataCountersUpdated(const webrtc::StreamDataCounters& counters,
                            uint32_t ssrc) override;
 
  private:
   struct SampleCounter {
     SampleCounter() : sum(0), num_samples(0) {}
     void Add(int sample);
-    int Avg(int min_required_samples) const;
+    int Avg(int64_t min_required_samples) const;
     void Reset();
 
    private:
-    int sum;
-    int num_samples;
+    int64_t sum;
+    int64_t num_samples;
   };
   struct QpCounters {
     SampleCounter vp8;
   };
 
   void UpdateHistograms() EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   void QualitySample() EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   Clock* const clock_;
@@ skipping 29 matching lines @@
   SampleCounter e2e_delay_counter_ GUARDED_BY(crit_);
   MaxCounter freq_offset_counter_ GUARDED_BY(crit_);
   int64_t first_report_block_time_ms_ GUARDED_BY(crit_);
   ReportBlockStats report_block_stats_ GUARDED_BY(crit_);
   QpCounters qp_counters_;  // Only accessed on the decoding thread.
   std::map<uint32_t, StreamDataCounters> rtx_stats_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_RECEIVE_STATISTICS_PROXY_H_