GitLab

The drag and drop autoscroll tests were timing out under
root-layer-scrolls but autoscroll itself worked. The issue was that the
LayoutView now owns the scrollbars when RLS is turned on so its
bounding box is larger. This meant that the autoscroll activation region
was further out so the test never activated autoscroll.

This test fixes the issue by excluding the scrollbars when calculating
the autoscroll regions. This means that the activation area starts from
the scrollbar-content edge, rather than the window edge.

Bug: 781431
Change-Id: Ifc0e03d8e5016055586f6242feddc7af50f90069
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Reviewed-on: https://chromium-review.googlesource.com/802519
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521162}