GitLab

Add overflow menu button and options to open settings and send feedback
on the toolbar. The button will be shown on bottom sheet opened and
hidden on sheet closed.

Bug: 831782
Change-Id: I37f9290b914f1adec06a3617e8c0a1fb54b2ccd3
Reviewed-on: https://chromium-review.googlesource.com/1022952
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553661}