The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1d7a446abb90361b12a3164c820ef58feee89099

commit 1d7a446abb90361b12a3164c820ef58feee89099
Author: Marijn Kruisselbrink <mek@chromium.org>
Date: Fri Aug 31 19:01:45 2018

[FileSystem] Expose sandboxed filesystem through new API.

Implements an initial version of getSystemDirectory, with the sandboxed
filesystem being the currently only supported option.

Tbr: jbroman@chromium.org
Bug: 879265
Change-Id: Ic044b00bc650e6e6d8b4aa618dd893ed9c3190ae
Reviewed-on: https://chromium-review.googlesource.com/1197403
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588106}
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/file_system_callbacks.cc
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/file_system_callbacks.h
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/file_system_directory_handle.cc
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/file_system_directory_handle.h
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/file_system_directory_handle.idl
[add] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/filesystem/get_system_directory_options.idl
[modify] https://crrev.com/1d7a446abb90361b12a3164c820ef58feee89099/third_party/blink/renderer/modules/modules_idl_files.gni