GitLab

Split the |UpdateCollapseState| function in two: one const function
|CalculateCollapseState| that returns a collapse state and the existing
|UpdateCollapseState| that returns void.

Also move the logic that alters the collapse state inside
|CalculateButtonVisibilityForCollapsedState| out of that function and
place it where it belongs.

Bug: 1048119
Change-Id: I49eaa86f914cf9910b47afde698aa82c8eaa0aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040955
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739036}