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 a10bcf86b3ece121621b0d561116387fd16dca93..b093cf1c1f888196c464501a49923cf94da22634 100644
--- a/net/reporting/reporting_browsing_data_remover.cc
+++ b/net/reporting/reporting_browsing_data_remover.cc
@@ -34,7 +34,8 @@ class ReportingBrowsingDataRemoverImpl : public ReportingBrowsingDataRemover {
 
     if (origin_filter.is_null()) {
       if (remove_reports)
-        cache->RemoveAllReports();
+        cache->RemoveAllReports(
+            ReportingReport::Outcome::ERASED_BROWSING_DATA_REMOVED);
       if (remove_clients)
         cache->RemoveAllClients();
       return;
@@ -50,7 +51,9 @@ class ReportingBrowsingDataRemoverImpl : public ReportingBrowsingDataRemover {
           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) {