Add a TouchFile function that operates on FilePaths + fixing a bug...

base/platform_file_posix.cc

 // Copyright (c) 2009 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 "base/platform_file.h"
 
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/stat.h>
 
@@ skipping 34 matching lines @@
       !(flags & PLATFORM_FILE_OPEN_ALWAYS)) {
     NOTREACHED();
     errno = EOPNOTSUPP;
     if (error_code)
       *error_code = PLATFORM_FILE_ERROR_FAILED;
     return kInvalidPlatformFileValue;
   }
 
   if (flags & PLATFORM_FILE_WRITE && flags & PLATFORM_FILE_READ) {
     open_flags |= O_RDWR;
-  } else if (flags & PLATFORM_FILE_WRITE) {
+  } else if (flags & PLATFORM_FILE_WRITE ||
+             flags & PLATFORM_FILE_WRITE_ATTRIBUTES) {
     open_flags |= O_WRONLY;
   } else if (!(flags & PLATFORM_FILE_READ)) {
     NOTREACHED();
   }
 
   if (flags & PLATFORM_FILE_TRUNCATE) {
     DCHECK(flags & PLATFORM_FILE_WRITE);
     open_flags |= O_TRUNC;
   }
 
@@ skipping 119 matching lines @@
 
   info->is_directory = S_ISDIR(file_info.st_mode);
   info->size = file_info.st_size;
   info->last_modified = base::Time::FromTimeT(file_info.st_mtime);
   info->last_accessed = base::Time::FromTimeT(file_info.st_atime);
   info->creation_time = base::Time::FromTimeT(file_info.st_ctime);
   return true;
 }
 
 }  // namespace base