Include unverified server-sent cert chain in reports

chrome/browser/ssl/cert_logger.proto

 // Copyright 2015 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.
 //
 // This protobuffer is intended to store reports from Chrome users of
 // certificate errors. A report will be sent from Chrome when it gets
 // e.g. a certificate for google.com that chains up to a root CA not expected by
 // Chrome for that origin, such as DigiNotar (compromised in July 2011), or
 // other pinning errors such as a blacklisted cert in the chain, or
 // (when opted in) other certificate validation errors like an expired
@@ skipping 65 matching lines @@
     ERR_CERT_NON_UNIQUE_NAME = 13;
   };
 
   // Certificate errors encountered (if any) when validating this
   // certificate chain.
   repeated CertError cert_error = 6;
 
   // Information about the interstitial that was shown to the user for
   // this certificate error.
   optional CertLoggerInterstitialInfo interstitial_info = 7;
+
+  // The unverified certificate chain as received by the client, as a
+  // series of PEM-encoded certificates. Can be different than
+  // |cert_chain|, which is the chain the client built during
+  // verification.
+  optional string unverified_cert_chain = 8;
 };