GitLab

MemoryFileStreamWriter called some ObfuscatedFileUtilMemoryDelegate
functions through IO thread while other functions in OFUMD are called
on a threadpool sequence. This could result in races in updating
directory structure.

To fix the issue, MemoryFileStreamWriter and MemoryFileStreamReader are
updated to call all OFUMD on the default task runner of the file system
context.

This CL was landed in crrev.com/c/2308721 and reverted due to flakiness.
The flaky crashes are believed to be because the buffer passed to
MemoryFileStreamReader::Read and MemoryFileStreamWrite::Write are not
thread safe.

Patchset1 is a copy of the previous CL and the issue is fixed in the
next patchsets.

Bug: 1100136
Change-Id: I619b82c2f4d23a020e9ce7e5e6c16980907b501b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398701Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805198}