GitLab

Using percentage width instead of constant number width for the
collection/image tiles. Leaving one percent width for the scrollbar.

Screencast:
https://screencast.googleplex.com/cast/NDYwMjgyNjA0NzA5NDc4NHxmNTgxMjYyOC0yNQ

Bug: 874742
Change-Id: I54f303a3ec294502669b26f0a6d31388e67b35dc
Reviewed-on: https://chromium-review.googlesource.com/1237515Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593074}