GitLab

It can be very useful when developing features to access the sandboxes.
This CL adds the possibility to dump the sandboxes to the Document
directory, which is accessible via the finder.

Change-Id: I0f760fdf59350dc85744048f374b8585392cc670
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316365Reviewed-by: Satoru Takabayashi <satorux@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793043}