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This CL prepares UI for rename external USB/SD drive in Files App. Because backend for this issue has not been finished yet I have added command line argument '--enable-external-drive-rename' which is used to enable UI part of the feature.

Bug: 274041
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ida64372e68108d975cc8b17b3cab99bcf80fc850
Reviewed-on: https://chromium-review.googlesource.com/604611Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Tomasz Mikolajewski <mtomasz@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Klemen Kozjek <klemenko@google.com>
Cr-Commit-Position: refs/heads/master@{#496562}