tree b13456fe96bac7bf1342e74bf82d0d2ea08727d4
parent 6949e794675c9f036fb9c6605e72ccffe62ce045
author Andre Le <leandre@chromium.org> 1638818209 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1638818209 +0000

NotificationRevamp: Add grouping expand/collapse animation.

- Add expand/collapse animation for group notification. This includes
fade in, fade out summary view and child notification, as well as
animations for the expand button when its size changes and the number
label changes its visibility.
- Make the expand button's base layer to be solid color for performance
since we add layers to its children views to do animation. This is also
better since we don't need to set background and repaint during
OnThemeChanged(). Also, remove the tray button style configuration
(highlight on focus) since this is not fit anymore.
- Move animation utils functions to a common file so that it can be used
in the expand button class.

Bug: 1233686
Change-Id: I44a6bd32eba341ea7467f1e9a7f9285bf37d2a06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3313894
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#948621}