glic: Fix open animation.

The open animation now always animates out to the default size, and from
there then animates to the glic size, if a glic has already requested a
size.

Bug: 391402352
Change-Id: Idd987311172f971f23802e37dbcc6d7f49aab152
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6198804
Commit-Queue: Erik Chen <erikchen@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Sana Akbani <sanaakbani@google.com>
Reviewed-by: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1411089}