GitLab

Removes HomeScreenDelegate::UpdateAfterHomeLauncherShown, which was only
updating expand arrow visibility, and move the logic to
HomeScreenDelegate::OnHomeLauncherTargetPositionChanged.
The method was used to update expand arrow visibility when home launcher
is shown. Given that OnHomeLauncherTargetPositionChanged is expected to
get called during the same sequence, expand arrow visilibity can be
moved there without losing much, and reduces the number of methods that
need to be called while using gestures to show/hide home launcher.

Also, updates how app list progress is calculated when app list is
scaled in tablet mode to ignore app list translation that was added
during scaling (without this, if arrow is painted while app list view is
scaled down, it might be slightly bent).

BUG=1022530

Change-Id: Ie284b413bdc576121757c1c4bb1b4280c97e06b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904235Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714006}