GitLab

Create base for area selection dialog. Currently just
display an empty dialog with the title and two bottom buttons
with logic/classes added to control the dialog.

Bug: 1153969
Change-Id: I489dc95d198037e57262938bf9f94fc6041dbbff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630825Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846251}