Refactor VerifyCertificateChain test data to include a key purpose

net/cert/internal/test_helpers.h

Index: net/cert/internal/test_helpers.h
diff --git a/net/cert/internal/test_helpers.h b/net/cert/internal/test_helpers.h
index 0e4cd17a58d8bd4f259a1b9267738858bf23b7ae..0cd2f70d2c54ffd70eb8a59e9028ff5f57df5f81 100644
--- a/net/cert/internal/test_helpers.h
+++ b/net/cert/internal/test_helpers.h
@@ -76,17 +76,33 @@ template <size_t N>
   return ReadTestDataFromPemFile(file_path_ascii, mappings, N);
 }
 
-// Reads a test case from |file_path_ascii| (which is relative to //src). Test
-// cases are comprised of a certificate chain, trust anchor, a timestamp to
-// validate at, and the expected result of verification.
+// Test cases are comprised of all the parameters to certificate
+// verification, as well as the expected outputs.
+struct VerifyCertChainTest {
+  VerifyCertChainTest();
+  ~VerifyCertChainTest();
+
+  // The chain of certificates (with the zero-th being the target).
+  ParsedCertificateList chain;
+
+  // The trust anchor to use when verifying the chain.
+  scoped_refptr<TrustAnchor> trust_anchor;
+
+  // The time to use when verifying the chain.
+  der::GeneralizedTime time;
+
+  // The expected result from verification.
+  bool expected_result = false;
+
+  // The expected errors from verification (as a string).
+  std::string expected_errors;
+};
+
+// Reads a test case from |file_path_ascii| (which is relative to //src).
 // Generally |file_path_ascii| will start with:
 //   net/data/verify_certificate_chain_unittest/
 void ReadVerifyCertChainTestFromFile(const std::string& file_path_ascii,
-                                     ParsedCertificateList* chain,
-                                     scoped_refptr<TrustAnchor>* trust_anchor,
-                                     der::GeneralizedTime* time,
-                                     bool* verify_result,
-                                     std::string* expected_errors);
+                                     VerifyCertChainTest* test);
 
 // Reads a data file relative to the src root directory.
 std::string ReadTestFileToString(const std::string& file_path_ascii);