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When animating app list to closed state, use the current target shelf
y coordinate at target animation bounds. Before this cl, app list was
using ideal shelf bounds, so the animation ends at the visible shelf
bounds, assuming that shelf will remain in visible state, which is the
case when the app list is hidden by clicking home button, but may not
always be true - for example, shelf gets hidden if app list is closed
using esc key.

BUG=1046198

Change-Id: Idb343482432fe9315082b45caff6679177c7d94f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027172Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736421}