Add the methods to change and get a posix file permission to file_util.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index 6cc13f021b772f2f7fe6fb1d3747f2422713a141..afa5664014c16b6e0d6fc78a95189decd4d48f49 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -196,6 +196,33 @@ BASE_EXPORT bool CreateSymbolicLink(const FilePath& target,
 // Reads the given |symlink| and returns where it points to in |target|.
 // Returns false upon failure.
 BASE_EXPORT bool ReadSymbolicLink(const FilePath& symlink, FilePath* target);
+
+// Bits ans masks of the file permission.
+enum FilePermissionBits {
+  FILE_PERMISSION_MASK              = S_IRWXU | S_IRWXU | S_IRWXO,

[satorux1, 2012/07/10 00:06:54]

-> S_IRWXU | S_IRWXG | S_IRWXO

[yoshiki, 2012/07/10 01:31:17]

Done.

+  FILE_PERMISSION_USER_MASK         = S_IRWXU,
+  FILE_PERMISSION_GROUP_MASK        = S_IRWXG,
+  FILE_PERMISSION_OTHERS_MASK       = S_IRWXO,
+
+  FILE_PERMISSION_READ_BY_USER      = S_IRUSR,
+  FILE_PERMISSION_WRITE_BY_USER     = S_IWUSR,
+  FILE_PERMISSION_EXECUTE_BY_USER   = S_IXUSR,
+  FILE_PERMISSION_READ_BY_GROUP     = S_IRGRP,
+  FILE_PERMISSION_WRITE_BY_GROUP    = S_IWGRP,
+  FILE_PERMISSION_EXECUTE_BY_GROUP  = S_IXGRP,
+  FILE_PERMISSION_READ_BY_OTHERS    = S_IROTH,
+  FILE_PERMISSION_WRITE_BY_OTHERS   = S_IWOTH,
+  FILE_PERMISSION_EXECUTE_BY_OTHERS = S_IXOTH,
+};
+
+// Reads the permission of the given |path|, storing the file permission
+// bits in |mode|. If |path| is symbolic link, |mode| is the permission of
+// a file which the symlink refers to.

[satorux1, 2012/07/10 00:06:54]

refers to -> points to

[yoshiki, 2012/07/10 01:31:17]

Done.

[satorux1, 2012/07/10 06:57:17]

points

+BASE_EXPORT bool GetPosixFilePermissions(const FilePath& path,
+                                         int* mode);
+// Sets the permission of the given |path|.

[satorux1, 2012/07/10 00:06:54]

If |path| is symbolic link, ...

[yoshiki, 2012/07/10 01:31:17]

Done.

+BASE_EXPORT bool SetPosixFilePermissions(const FilePath& path,
+                                         int mode);
 #endif  // defined(OS_POSIX)
 
 #if defined(OS_WIN)