Add parsing code for RFC 5280 PolicyConstraints.

net/cert/internal/parsed_certificate.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 "net/cert/internal/parsed_certificate.h"
 
 #include "net/cert/internal/certificate_policies.h"
 #include "net/cert/internal/extended_key_usage.h"
 #include "net/cert/internal/name_constraints.h"
 #include "net/cert/internal/signature_algorithm.h"
@@ skipping 176 matching lines @@
     }
 
     // Policies.
     if (result->GetExtension(CertificatePoliciesOid(), &extension)) {
       result->has_policy_oids_ = true;
       if (!ParseCertificatePoliciesExtension(extension.value,
                                              &result->policy_oids_)) {
         return nullptr;
       }
     }
+
+    // Policy constraints.
+    if (result->GetExtension(PolicyConstraintsOid(), &extension)) {
+      result->has_policy_constraints_ = true;
+      if (!ParsePolicyConstraints(extension.value,
+                                  &result->policy_constraints_)) {
+        return nullptr;
+      }
+    }
   }
 
   return result;
 }
 
 }  // namespace net