tree a07acb0dc3bedf6a36cca3df206ce7cd114fda33
parent c8c63300ac8ecb66d8126af5407257209ae59044
author Bryan Henry <bryanhenry@google.com> 1659052050 -0700
committer Brett Wilson <brettw@chromium.org> 1659740424 +0000

[file_util] Add CreateAndOpenTemporaryFileInDir from chromium src/base

This brings CreateAndOpenTemporaryFileInDir over from upstream
chromium's file_util since it will be useful for performing "atomic
writes" (i.e. write to temp + ReplaceFile) in GN.

Slight modifications were made since GN's src/base is older than or has
drifted from chromium's in parts. base::File::Flags::FLAG_CREATE was
added as it was needed by the Windows temp file implementation (only
FLAG_CREATE_ALWAYS existed so far), and the support for this flag was
added to both the Posix and Windows File::DoInitialize() impls.
The upstream impl also makes use of base::File's exclusive
read/write/delete flags and DeleteOnClose support that only work on
Windows, but these are unneeded and so were not ported over in this
change.

Change-Id: I90b5c41f86900bce2aafdea8cb8bb59604998ef0
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/14320
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>