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This test wants to check scrolling over a scrollbar but was scrolling
over the scroll corner instead. The scroll corner is considered part of
the scroller when scrolling from the main thread but not when scrolling
from the compositor thread. This CL move the point to be over the
scrollbar so that the test has consistent behavior on main and
compositor threads. We also move it to fast/scrolling so it gets test
coverage on both threads.

Some cleanup has broken rename detection in Gerrit. See Base->PS1 for
rename and above change. PS1->PS2 makes the test more readable.

Bug: 915926,1090860
Change-Id: I25afd7c214505d38c08e456496d5bfa5a47ee74b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442353Reviewed-by: Liviu Tinta <liviutinta@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812674}