Add parsing for RFC 5280's PolicyMappings certificate extension.

net/cert/internal/parsed_certificate.cc

Index: net/cert/internal/parsed_certificate.cc
diff --git a/net/cert/internal/parsed_certificate.cc b/net/cert/internal/parsed_certificate.cc
index 776372e64d5d24f7c2174347faec3206b36262c8..53f0dd549d0fd67e4d94ae404898bcbad9d17bbf 100644
--- a/net/cert/internal/parsed_certificate.cc
+++ b/net/cert/internal/parsed_certificate.cc
@@ -203,6 +203,23 @@ scoped_refptr<ParsedCertificate> ParsedCertificate::CreateInternal(
         return nullptr;
       }
     }
+
+    // Policy mappings.
+    if (result->GetExtension(PolicyMappingsOid(), &extension)) {
+      result->has_policy_mappings_ = true;
+      if (!ParsePolicyMappings(extension.value, &result->policy_mappings_)) {
+        return nullptr;
+      }
+    }
+
+    // Inhibit Any Policy.
+    if (result->GetExtension(InhibitAnyPolicyOid(), &extension)) {
+      result->has_inhibit_any_policy_ = true;
+      if (!ParseInhibitAnyPolicy(extension.value,
+                                 &result->inhibit_any_policy_)) {
+        return nullptr;
+      }
+    }
   }
 
   return result;