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We recently re-implemented auto-expansion of notification
(crbug.com/810656), but it sometimes caused some junkness
while animation when it was auto-expanded. That was because
auto-expanded is done in the final phase of layouting.

This CL moves the auto-expansion to earlier phase:
- (on add): just before the view is added to the list
- (on update): just before the view is updated in the list
- (on remove): just after the view is removed from the list

Bug: 810656
Test: manual
Change-Id: I015f45f74eef37f89f11edc1b3b346d18771862c
Reviewed-on: https://chromium-review.googlesource.com/958757
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543990}