Validate MessageHeader before using

mojo/public/tests/test_support_private.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_TESTS_TEST_SUPPORT_PRIVATE_H_
 #define MOJO_PUBLIC_TESTS_TEST_SUPPORT_PRIVATE_H_
 
+#include <stdio.h>
+
 #include "mojo/public/c/test_support/test_support.h"
 
 namespace mojo {
 namespace test {
 
 // Implementors of the test support APIs can use this interface to install their
 // implementation into the mojo_test_support dynamic library.
 class MOJO_TEST_SUPPORT_EXPORT TestSupport {
  public:
   virtual ~TestSupport();
 
   static void Init(TestSupport* test_support);
   static TestSupport* Get();
   static void Reset();
 
   virtual void LogPerfResult(const char* test_name,
                              double value,
                              const char* units) = 0;
+  virtual FILE* OpenSourceRootRelativeFile(const char* relative_path) = 0;
+  virtual char** EnumerateSourceRootRelativeDirectory(
+      const char* relative_path) = 0;
 };
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_TESTS_TEST_SUPPORT_PRIVATE_H_