GitLab

Report animation smoothness for the transition into the hotseat in the
HomeLauncher.

The original change caused use-of-uninitialized-value flaky tests. These
were caused because the HotseatTransitionAnimator could outlive the
ShelfWidget in some tests.
This is a possible fix for the issue by avoiding the destruction of
|hotseat_transition_animator_| until the Shelf Widget is destroyed, thus
destroying the animator itself. Shelf Widget destruction occurs usually
after Shutdown().

Original CL: http://crrev.com/c/1917941

Bug: 1022178, 1022177, 1028255, 1030222
Change-Id: Ibf2030df7408704e8aa96ca863bcd55ba333174f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954355Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722641}