GitLab

This CL adds an util to know when the toolbar is split.

Bug: 804748
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I7d6accb32de848ff2b3e0ff8aef68d7c278aeb9a
Reviewed-on: https://chromium-review.googlesource.com/916194Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536961}