Run Pepper unit tests in Native Client, part 1 (pepper repo)....

tests/test_file_ref.cc

 // Copyright (c) 2010 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 "ppapi/tests/test_file_ref.h"
 
 #include <stdio.h>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/dev/ppb_file_io_dev.h"
@@ skipping 47 matching lines @@
 
 std::string ReportMismatch(const std::string& method_name,
                            const std::string& returned_result,
                            const std::string& expected_result) {
   return method_name + " returned '" + returned_result + "'; '" +
       expected_result + "' expected.";
 }
 
 std::string ReportError(const char* method, int32_t error) {
   char error_as_string[12];
-  sprintf(error_as_string, "%d", error);
+  sprintf(error_as_string, "%d", static_cast<int>(error));
   std::string result = method + std::string(" failed with error: ") +
       error_as_string;
   if (error == PP_ERROR_NOSPACE)
     result += ". Did you run the test with --unlimited-quota-for-files?";
   return result;
 }
 
 }  // namespace
 
 bool TestFileRef::Init() {
@@ skipping 414 matching lines @@
 
   pp::FileRef_Dev target_nested_dir_ref(file_system, "/dir_rename_1");
   rv = nested_dir_ref.Rename(target_nested_dir_ref, callback);
   if (rv == PP_ERROR_WOULDBLOCK)
     rv = callback.WaitForResult();
   if (rv != PP_ERROR_FAILED)
     return ReportError("FileSystem::Rename", rv);
 
   return "";
 }