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This delegate will be used to implement server-side copy/move, and
to intercept certain operations (eg. read directory) to provide UI in
error cases.

Bug: 1054704, 1054689
Change-Id: I506a8e606c3fdf40d9a0016dfde1b9954c1b4f39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106039Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751180}