GitLab

Add document outline view by porting the bookmarks list to the sidenav
from the viewer toolbar.

Bug: 1116574
Change-Id: I571dc8e6f6f7288debff5a9abcdc4e2f93877366
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357673
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798859}