Add histogram stats for average QP per frame for VP9 (for sent video streams):

webrtc/system_wrappers/include/metrics.h

 //
 // Copyright (c) 2014 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 51 matching lines @@
 
 // Macros for adding samples to a named histogram.
 
 // Histogram for counters (exponentially spaced buckets).
 #define RTC_HISTOGRAM_COUNTS_100(name, sample) \
   RTC_HISTOGRAM_COUNTS(name, sample, 1, 100, 50)
 
 #define RTC_HISTOGRAM_COUNTS_200(name, sample) \
   RTC_HISTOGRAM_COUNTS(name, sample, 1, 200, 50)
 
+#define RTC_HISTOGRAM_COUNTS_500(name, sample) \
+  RTC_HISTOGRAM_COUNTS(name, sample, 1, 500, 50)
+
 #define RTC_HISTOGRAM_COUNTS_1000(name, sample) \
   RTC_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50)
 
 #define RTC_HISTOGRAM_COUNTS_10000(name, sample) \
   RTC_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50)
 
 #define RTC_HISTOGRAM_COUNTS_100000(name, sample) \
   RTC_HISTOGRAM_COUNTS(name, sample, 1, 100000, 50)
 
 #define RTC_HISTOGRAM_COUNTS(name, sample, min, max, bucket_count) \
   RTC_HISTOGRAM_COMMON_BLOCK(name, sample, false, \
       webrtc::metrics::HistogramFactoryGetCounts(name, min, max, bucket_count))
 
 // RTC_HISTOGRAM_COUNTS with logging.
 #define RTC_LOGGED_HISTOGRAM_COUNTS_100(name, sample) \
   RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 100, 50)
 
 #define RTC_LOGGED_HISTOGRAM_COUNTS_200(name, sample) \
   RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 200, 50)
 
+#define RTC_LOGGED_HISTOGRAM_COUNTS_500(name, sample) \
+  RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 500, 50)
+
 #define RTC_LOGGED_HISTOGRAM_COUNTS_1000(name, sample) \
   RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50)
 
 #define RTC_LOGGED_HISTOGRAM_COUNTS_10000(name, sample) \
   RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50)
 
 #define RTC_LOGGED_HISTOGRAM_COUNTS_100000(name, sample) \
   RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 100000, 50)
 
 #define RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, min, max, bucket_count) \
@@ skipping 66 matching lines @@
 // Macros for calling a histogram with varying name (e.g. when using a metric
 // in different modes such as real-time vs screenshare).
 #define RTC_HISTOGRAMS_COUNTS_100(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_COUNTS(name, sample, 1, 100, 50))
 
 #define RTC_HISTOGRAMS_COUNTS_200(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_COUNTS(name, sample, 1, 200, 50))
 
+#define RTC_HISTOGRAMS_COUNTS_500(index, name, sample) \
+  RTC_HISTOGRAMS_COMMON(index, name, sample, \
+      RTC_HISTOGRAM_COUNTS(name, sample, 1, 500, 50))
+
 #define RTC_HISTOGRAMS_COUNTS_1000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50))
 
 #define RTC_HISTOGRAMS_COUNTS_10000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50))
 
 #define RTC_HISTOGRAMS_COUNTS_100000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_COUNTS(name, sample, 1, 100000, 50))
 
 #define RTC_HISTOGRAMS_ENUMERATION(index, name, sample, boundary) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_ENUMERATION(name, sample, boundary))
 
 #define RTC_HISTOGRAMS_PERCENTAGE(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_HISTOGRAM_PERCENTAGE(name, sample))
 
 // RTC_HISTOGRAMS_COUNTS with logging.
 #define RTC_LOGGED_HISTOGRAMS_COUNTS_100(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 100, 50))
 
 #define RTC_LOGGED_HISTOGRAMS_COUNTS_200(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 200, 50))
 
+#define RTC_LOGGED_HISTOGRAMS_COUNTS_500(index, name, sample) \
+  RTC_HISTOGRAMS_COMMON(index, name, sample, \
+      RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 500, 50))
+
 #define RTC_LOGGED_HISTOGRAMS_COUNTS_1000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50))
 
 #define RTC_LOGGED_HISTOGRAMS_COUNTS_10000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
       RTC_LOGGED_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50))
 
 #define RTC_LOGGED_HISTOGRAMS_COUNTS_100000(index, name, sample) \
   RTC_HISTOGRAMS_COMMON(index, name, sample, \
@@ skipping 48 matching lines @@
 // Function for adding a |sample| to a histogram.
 // |name| can be used to verify that it matches the histogram name.
 void HistogramAdd(
     Histogram* histogram_pointer, const std::string& name, int sample);
 
 }  // namespace metrics
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_METRICS_H_