[fsp] Convert base::File::Error to string.
This patch adds a utility function which converts a base::File::Error code
to a human readable form. It will be used for logging request errors in the
File System Provider API.
TEST=Not used yet.
BUG=376095
Review URL: https://codereview.chromium.org/308613002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273779 0039d316-1c4b-4281-b951-d872f2087c98
CrOS-Libchrome-Original-Commit: b73427e731ca23234f23124b5ac25748287d9703
diff --git a/base/files/file.h b/base/files/file.h
index f1a8377..1913bc7 100644
--- a/base/files/file.h
+++ b/base/files/file.h
@@ -14,6 +14,8 @@
#include <sys/stat.h>
#endif
+#include <string>
+
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/files/scoped_file.h"
@@ -289,6 +291,9 @@
static Error OSErrorToFileError(int saved_errno);
#endif
+ // Converts an error value to a human-readable form. Used for logging.
+ static std::string ErrorToString(Error error);
+
private:
void SetPlatformFile(PlatformFile file);