Parse an application/x-x509-user-cert response with

net/base/x509_certificate.cc

Index: net/base/x509_certificate.cc
===================================================================
--- net/base/x509_certificate.cc	(revision 134554)
+++ net/base/x509_certificate.cc	(working copy)
@@ -414,6 +414,7 @@
       // also be DER encoded certificates wrapped inside of PEM blocks.
       format = FORMAT_PEM_CERT_SEQUENCE;
       certificates.push_back(handle);
+      fprintf(stderr, "PEM: format %d\n", (int)format);
       continue;
     }
 
@@ -426,6 +427,8 @@
         if (format & kFormatDecodePriority[i]) {
           certificates = CreateOSCertHandlesFromBytes(decoded.c_str(),
               decoded.size(), kFormatDecodePriority[i]);
+          if (!certificates.empty())
+            fprintf(stderr, "PEM: format %d\n", (int)kFormatDecodePriority[i]);
         }
       }
     }
@@ -442,9 +445,12 @@
   // as a PEM certificate/chain.
   for (size_t i = 0; certificates.empty() &&
        i < arraysize(kFormatDecodePriority); ++i) {
-    if (format & kFormatDecodePriority[i])
+    if (format & kFormatDecodePriority[i]) {
       certificates = CreateOSCertHandlesFromBytes(data, length,
                                                   kFormatDecodePriority[i]);
+      if (!certificates.empty())
+        fprintf(stderr, "Binary: format %d\n", (int)kFormatDecodePriority[i]);
+    }
   }
 
   CertificateList results;
@@ -457,6 +463,9 @@
     X509Certificate* result = CreateFromHandle(*it, OSCertHandles());
     results.push_back(scoped_refptr<X509Certificate>(result));
     FreeOSCertHandle(*it);
+    fprintf(stderr, "Certificate: %s issued by %s\n",
+            result->subject().common_name.c_str(),
+            result->issuer().common_name.c_str());
   }
 
   return results;