GitLab

This flag will be used to develop new windowing related behavior for
Desktop PWAs.

Bug: 729923
Change-Id: I594eadbdf9f00928e9c1963f510e4b7c7b7788f7
Reviewed-on: https://chromium-review.googlesource.com/566263
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485874}