Include unverified server-sent cert chain in reports

chrome/browser/ssl/cert_logger.proto

Index: chrome/browser/ssl/cert_logger.proto
diff --git a/chrome/browser/ssl/cert_logger.proto b/chrome/browser/ssl/cert_logger.proto
index d53b8480a011d4d056fed5ac75993491a3b9c7b3..bb11bf29266527e772547a1d1edcffa5e9cda083 100644
--- a/chrome/browser/ssl/cert_logger.proto
+++ b/chrome/browser/ssl/cert_logger.proto
@@ -83,4 +83,10 @@ message CertLoggerRequest {
   // 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;
 };