Log aggregated abort metrics when histograms are uploaded

components/metrics/net/network_metrics_provider.h

Index: components/metrics/net/network_metrics_provider.h
diff --git a/components/metrics/net/network_metrics_provider.h b/components/metrics/net/network_metrics_provider.h
index e1f02ddf3647bcc8668145829949b889e51cbd45..5dbb5593b2491b0e358b6eeb1b3f72551b5c277a 100644
--- a/components/metrics/net/network_metrics_provider.h
+++ b/components/metrics/net/network_metrics_provider.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/metrics/histogram_base.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/net/wifi_access_point_info_provider.h"
 #include "components/metrics/proto/system_profile.pb.h"
@@ -52,6 +53,9 @@ class NetworkMetricsProvider
       const WifiAccessPointInfoProvider::WifiAccessPointInfo& info,
       SystemProfileProto::Network* network_proto);
 
+  // Logs metrics that are functions of other metrics being uploaded.
+  void LogAggregatedMetrics();
+
   // Task runner used for blocking file I/O.
   base::TaskRunner* io_task_runner_;
 
@@ -69,6 +73,11 @@ class NetworkMetricsProvider
   // Helper object for retrieving connected wifi access point information.
   scoped_ptr<WifiAccessPointInfoProvider> wifi_access_point_info_provider_;
 
+  // These metrics track histogram totals for the Net.ErrorCodesForMainFrame3
+  // histogram. They are used to compute deltas at upload time.
+  base::HistogramBase::Count total_aborts_;
+  base::HistogramBase::Count total_codes_;
+
   base::WeakPtrFactory<NetworkMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkMetricsProvider);