Adding UMA for daily video percent savings for data reduction proxy

components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc
index 26bc2dbfa7af7da7fa2c32613b25dc7086e244f9..a46e1d2cf59ffef45c65497d88ed57be6e6cdde0 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc
@@ -823,20 +823,42 @@ void DataReductionProxyCompressionStats::RecordRequestSizePrefs(
           "Net.DailyContentLength_DataReductionProxyEnabled_Application");
 
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyOriginalContentLengthWithDataReductionProxyEnabledVideo,
           "Net.DailyOriginalContentLength_DataReductionProxyEnabled_Video");
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyContentLengthWithDataReductionProxyEnabledVideo,
           "Net.DailyContentLength_DataReductionProxyEnabled_Video");
+      int64_t original_length_with_data_reduction_enabled_video = GetInt64(
+          data_reduction_proxy::prefs::
+              kDailyOriginalContentLengthWithDataReductionProxyEnabledVideo);
+      int64_t received_length_with_data_reduction_enabled_video =
+          GetInt64(data_reduction_proxy::prefs::
+                       kDailyContentLengthWithDataReductionProxyEnabledVideo);
+      int percent_data_reduction_proxy_enabled_video = 0;
+      // UMA percentage cannot be negative.
+      // The DataReductionProxy server will only serve optimized video content
+      // if the optimized content is smaller than the original content.
+      // TODO(ryansturm): Track daily data inflation percents here and
+      // elsewhere. http://crbug.com/595818
+      if (original_length_with_data_reduction_enabled_video >
+          received_length_with_data_reduction_enabled_video) {
+        percent_data_reduction_proxy_enabled_video =
+            100 * (original_length_with_data_reduction_enabled_video -
+                   received_length_with_data_reduction_enabled_video) /
+            original_length_with_data_reduction_enabled_video;
+      }
+      UMA_HISTOGRAM_PERCENTAGE(
+          "Net.DailyContentSavingPercent_DataReductionProxyEnabled_Video",
+          percent_data_reduction_proxy_enabled_video);
 
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyOriginalContentLengthWithDataReductionProxyEnabledUnknown,
           "Net.DailyOriginalContentLength_DataReductionProxyEnabled_"
           "UnknownMime");
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyContentLengthWithDataReductionProxyEnabledUnknown,
           "Net.DailyContentLength_DataReductionProxyEnabled_UnknownMime")
@@ -851,20 +873,42 @@ void DataReductionProxyCompressionStats::RecordRequestSizePrefs(
           "Net.DailyContentLength_ViaDataReductionProxy_Application");
 
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyOriginalContentLengthViaDataReductionProxyVideo,
           "Net.DailyOriginalContentLength_ViaDataReductionProxy_Video");
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyContentLengthViaDataReductionProxyVideo,
           "Net.DailyContentLength_ViaDataReductionProxy_Video");
+      int64_t original_length_via_data_reduction_proxy_video =
+          GetInt64(data_reduction_proxy::prefs::
+                       kDailyOriginalContentLengthViaDataReductionProxyVideo);
+      int64_t received_length_via_data_reduction_proxy_video =
+          GetInt64(data_reduction_proxy::prefs::
+                       kDailyContentLengthViaDataReductionProxyVideo);
+      int percent_via_data_reduction_proxy_video = 0;
+      // UMA percentage cannot be negative.
+      // The DataReductionProxy server will only serve optimized video content
+      // if the optimized content is smaller than the original content.
+      // TODO(ryansturm): Track daily data inflation percents here and
+      // elsewhere. http://crbug.com/595818
+      if (original_length_via_data_reduction_proxy_video >
+          received_length_via_data_reduction_proxy_video) {
+        percent_via_data_reduction_proxy_video =
+            100 * (original_length_via_data_reduction_proxy_video -
+                   received_length_via_data_reduction_proxy_video) /
+            original_length_via_data_reduction_proxy_video;
+      }
+      UMA_HISTOGRAM_PERCENTAGE(
+          "Net.DailyContentSavingPercent_ViaDataReductionProxy_Video",
+          percent_via_data_reduction_proxy_video);
 
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyOriginalContentLengthViaDataReductionProxyUnknown,
           "Net.DailyOriginalContentLength_ViaDataReductionProxy_UnknownMime");
       RECORD_INT64PREF_TO_HISTOGRAM(
           data_reduction_proxy::prefs::
               kDailyContentLengthViaDataReductionProxyUnknown,
           "Net.DailyContentLength_ViaDataReductionProxy_UnknownMime");
     }