Add retry information to certificate reports.

components/certificate_reporting/cert_logger.proto

Index: components/certificate_reporting/cert_logger.proto
diff --git a/components/certificate_reporting/cert_logger.proto b/components/certificate_reporting/cert_logger.proto
index 452ec03c22cfe54ae4a1481fc2b81ad452b5250d..e049841408afec43bdedcd97b1fa2da8dc23edb9 100644
--- a/components/certificate_reporting/cert_logger.proto
+++ b/components/certificate_reporting/cert_logger.proto
@@ -126,4 +126,8 @@ message CertLoggerRequest {
   // Information about features that were enabled or disabled for the
   // user that might affect certificate validation.
   optional CertLoggerFeaturesInfo features_info = 10;
+
+  // False when the report is attempted to be uploaded for the first time. True
+  // in all other uploads.
+  optional bool is_retry_upload = 11;
 };