GitLab

Add blank dialog for now.
Both Action and Cancel buttons currently close the dialog.
Current view: http://screen/BpiwRzGMHfgHgYw
Design doc in progress: http://go/cros-lang-settings-step-5

Bug: 1113439
Change-Id: I93c8e7a432e67a2c785b258d8bfa661c1360b543
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379467
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802999}