Add a key purpose parameter to Certificate PathBuilder.

net/cert/internal/path_builder_verify_certificate_chain_unittest.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/path_builder.h"
 
 #include "net/cert/internal/cert_issuer_source_static.h"
 #include "net/cert/internal/signature_policy.h"
 #include "net/cert/internal/trust_store_in_memory.h"
 #include "net/cert/internal/verify_certificate_chain_typed_unittest.h"
@@ skipping 12 matching lines @@
     TrustStoreInMemory trust_store;
     trust_store.AddTrustAnchor(test.trust_anchor);
 
     CertIssuerSourceStatic intermediate_cert_issuer_source;
     for (size_t i = 1; i < test.chain.size(); ++i)
       intermediate_cert_issuer_source.AddCert(test.chain[i]);
 
     CertPathBuilder::Result result;
     // First cert in the |chain| is the target.
     CertPathBuilder path_builder(test.chain.front(), &trust_store,
-                                 &signature_policy, test.time, &result);
+                                 &signature_policy, test.time, test.key_purpose,
+                                 &result);
     path_builder.AddCertIssuerSource(&intermediate_cert_issuer_source);
 
     path_builder.Run();
     EXPECT_EQ(test.expected_result, result.HasValidPath());
   }
 };
 
 }  // namespace
 
 INSTANTIATE_TYPED_TEST_CASE_P(PathBuilder,
                               VerifyCertificateChainSingleRootTest,
                               PathBuilderDelegate);
 
 }  // namespace net