Distinguish between SCT invalidity reasons in UMA

chrome/browser/ssl/chrome_expect_ct_reporter.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ssl/chrome_expect_ct_reporter.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 134 matching lines @@
 
   std::unique_ptr<base::ListValue> unknown_scts(new base::ListValue());
   std::unique_ptr<base::ListValue> invalid_scts(new base::ListValue());
   std::unique_ptr<base::ListValue> valid_scts(new base::ListValue());
 
   for (const auto& sct_and_status : ssl_info.signed_certificate_timestamps) {
     switch (sct_and_status.status) {
       case net::ct::SCT_STATUS_LOG_UNKNOWN:
         AddUnknownSCT(sct_and_status, unknown_scts.get());
         break;
-      case net::ct::SCT_STATUS_INVALID:
+      case net::ct::SCT_STATUS_INVALID_SIGNATURE:
+      case net::ct::SCT_STATUS_INVALID_TIMESTAMP:
         AddInvalidSCT(sct_and_status, invalid_scts.get());
         break;
       case net::ct::SCT_STATUS_OK:
         AddValidSCT(sct_and_status, valid_scts.get());
         break;
       default:
         NOTREACHED();
     }
   }
 
   report.Set("unknown-scts", std::move(unknown_scts));
   report.Set("invalid-scts", std::move(invalid_scts));
   report.Set("valid-scts", std::move(valid_scts));
 
   std::string serialized_report;
   if (!base::JSONWriter::Write(report, &serialized_report)) {
     LOG(ERROR) << "Failed to serialize Expect CT report";
     return;
   }
 
   UMA_HISTOGRAM_BOOLEAN("SSL.ExpectCTReportSendingAttempt", true);
 
   report_sender_->Send(report_uri, serialized_report);
 }