GitLab

This change works by keeping track of a requested removal time and
fading out the spinner over that duration. This is a continuation of
crrev.com/c/1830254.

The external API of this class is preserved, w.r.t. HasApp() calls and
the like, but internally the controller will only actually evict its
items once the fade-out animation has completed.

Bug: 922977
Change-Id: Ief07b33157403d2141187558dabd866a7ebbbd5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837323Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Nic Hollingum <hollingum@google.com>
Cr-Commit-Position: refs/heads/master@{#704036}