Reporting: Add histograms.

net/reporting/reporting_browsing_data_remover.cc

Index: net/reporting/reporting_browsing_data_remover.cc
diff --git a/net/reporting/reporting_browsing_data_remover.cc b/net/reporting/reporting_browsing_data_remover.cc
index d92a78e2910e553f77e32e424570aeb1a8bef720..5983fe6be9540f39c2ba664c46f843ce39adb09e 100644
--- a/net/reporting/reporting_browsing_data_remover.cc
+++ b/net/reporting/reporting_browsing_data_remover.cc
@@ -23,8 +23,10 @@ void ReportingBrowsingDataRemover::RemoveBrowsingData(
   bool remove_clients = (data_type_mask & DATA_TYPE_CLIENTS) != 0;
 
   if (origin_filter.is_null()) {
-    if (remove_reports)
-      cache->RemoveAllReports();
+    if (remove_reports) {
+      cache->RemoveAllReports(
+          ReportingReport::Outcome::ERASED_BROWSING_DATA_REMOVED);
+    }
     if (remove_clients)
       cache->RemoveAllClients();
     return;
@@ -40,7 +42,9 @@ void ReportingBrowsingDataRemover::RemoveBrowsingData(
         reports_to_remove.push_back(report);
     }
 
-    cache->RemoveReports(reports_to_remove);
+    cache->RemoveReports(
+        reports_to_remove,
+        ReportingReport::Outcome::ERASED_BROWSING_DATA_REMOVED);
   }
 
   if (remove_clients) {