Validate MessageHeader before using

mojo/public/cpp/test_support/test_support.h

 // Copyright 2014 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.
 
 #ifndef MOJO_PUBLIC_CPP_TEST_SUPPORT_TEST_SUPPORT_H_
 #define MOJO_PUBLIC_CPP_TEST_SUPPORT_TEST_SUPPORT_H_
 
+#include <string>
+#include <vector>
+
 #include "mojo/public/c/test_support/test_support.h"
 
 namespace mojo {
 namespace test {
 
 inline void LogPerfResult(const char* test_name,
                           double value,
                           const char* units) {
   MojoTestSupportLogPerfResult(test_name, value, units);
 }
 
+// Opens text file relative to the source root for reading.
+inline FILE* OpenSourceRootRelativeFile(const std::string& relative_path) {
+  return MojoTestSupportOpenSourceRootRelativeFile(relative_path.c_str());
+}
+
+// Returns the list of regular files in a directory relative to the source root.
+std::vector<std::string> EnumerateSourceRootRelativeDirectory(
+    const std::string& relative_path);
+
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_TEST_SUPPORT_TEST_SUPPORT_H_