GitLab

Add in a new settings button on the capture bar that is used to toggle a
settings bar. This bar will start off only holding one setting, to
toggle audio recording in video capture. Settings for the audio
recording flag will persist between sessions.

Bug: 1145273
Test: manual, added test
Change-Id: I2ffbd3ac2971254c9c2227a42c64f511793ce795
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606118
Commit-Queue: Richard Chui <richui@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843943}