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This CL adds handlers for buttons on the Bluetooth disabled view.

Misc: test minor refactoring.

BUG=1106937,1126208
TEST=unittested.

Change-Id: I891d81bb67f3ef7b52cdee8835d66a05f49b8341
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495827
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821610}