Add Locking calls to file_io.h plus implementations and test

util/test/errors.cc

Index: util/test/errors.cc
diff --git a/util/test/errors.cc b/util/test/errors.cc
index 1fd3a0f515084ad43dae2c377d948f88094bd61a..00f8037d689f0ce6010931c5495030845e9c644c 100644
--- a/util/test/errors.cc
+++ b/util/test/errors.cc
@@ -17,6 +17,7 @@
 #include <errno.h>
 
 #include "build/build_config.h"
+#include "base/logging.h"
 #include "base/strings/stringprintf.h"
 
 #if defined(OS_POSIX)
@@ -47,5 +48,15 @@ std::string ErrnoMessage(const std::string& base) {
   return ErrnoMessage(errno, base);
 }
 
+#if defined(OS_WIN)
+std::string ErrorMessage(const std::string& base) {
+  return base::StringPrintf(
+      "%s%s%s",
+      base.c_str(),
+      base.empty() ? "" : ": ",
+      base::SystemErrorCodeToString(GetLastError()).c_str());

[Mark Mentovai, 2015/03/20 15:03:56]

This is not declared by mini_chromium’s logging.h. Yet. You can add it there and
bring the DEPS roll into this change.

[scottmg, 2015/03/20 21:07:35]

I admit I had not yet tested back on Windows yet. Done.

+}
+#endif
+
 }  // namespace test
 }  // namespace crashpad