Files App: Add tests for volume name renaming

This CL adds automated tests for volume rename functionality inside of
cros disks client.

BUG=274041
CQ-DEPEND=CL:616510

Change-Id: Ibd4da890471c379c15c3b70a00730a63a5843eae
Reviewed-on: https://chromium-review.googlesource.com/628616
Commit-Queue: Klemen Kozjek <klemenko@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#497557}
2 files changed