Reporting: Add histograms.

net/reporting/reporting_header_parser.h

Index: net/reporting/reporting_header_parser.h
diff --git a/net/reporting/reporting_header_parser.h b/net/reporting/reporting_header_parser.h
index fc165f31116dd6e5bb8e5af88f67f45c0fea49bd..c94f05372273e570483afd569757a60b506081c5 100644
--- a/net/reporting/reporting_header_parser.h
+++ b/net/reporting/reporting_header_parser.h
@@ -18,6 +18,10 @@ class ReportingContext;
 
 class NET_EXPORT ReportingHeaderParser {
  public:
+  static void RecordHeaderDiscardedForNoReportingService();
+  static void RecordHeaderDiscardedForInvalidSSLInfo();
+  static void RecordHeaderDiscardedForCertStatusError();
+
   static void ParseHeader(ReportingContext* context,
                           const GURL& url,
                           const std::string& json_value);