Define kInvalidPlatformFile in base

base/files/file.h

 // Copyright (c) 2012 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 BASE_FILES_FILE_H_
 #define BASE_FILES_FILE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 11 matching lines @@
 #include "base/win/scoped_handle.h"
 #endif
 
 #if defined(OS_POSIX)
 #include <sys/stat.h>
 #endif
 
 namespace base {
 
 #if defined(OS_WIN)
-typedef HANDLE PlatformFile;
+using PlatformFile = HANDLE;
+
+const PlatformFile kInvalidPlatformFile = INVALID_HANDLE_VALUE;
 #elif defined(OS_POSIX)
-typedef int PlatformFile;
+using PlatformFile = int;
 
+const PlatformFile kInvalidPlatformFile = -1;
 #if defined(OS_BSD) || defined(OS_MACOSX) || defined(OS_NACL)
 typedef struct stat stat_wrapper_t;
 #else
 typedef struct stat64 stat_wrapper_t;
 #endif
 #endif  // defined(OS_POSIX)
 
 // Thin wrapper around an OS-level file.
 // Note that this class does not provide any support for asynchronous IO, other
 // than the ability to create asynchronous handles on Windows.
@@ skipping 284 matching lines @@
 
   Error error_details_;
   bool created_;
   bool async_;
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_H_