GitLab

Implement a two-up view toggle button in PDF Viewer's zoom toolbar.
This button is available when feature "pdf-two-up-view" is enabled.

Bug: 51472
Change-Id: Icf6867e2897f1090b6b9fd8e9494006f648ffdd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2012837Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Hui Yingst <nigi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748840}