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When an app is being dragged from app list to shelf,
a new shelf item is created and made hidden by setting
its size to (0,0). It is supposed to stay at this size
until the drag is complete.

However, if a drag started very soon after some other shelf
manipulation (e.g. drag leaving the shelf and re-entering quickly),
it is possible for AnimateToIdealBounds to be called asynchronously.
The hidden item's bounds will be animated to full size, resulting
in a visible icon.

This CL makes AnimateToIdealBounds ignore shelf items with (0,0) size.

Bug: 985631
Test: manual
Change-Id: Ieb23beb6ecf635ae60613f5f6217219f7963999b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862507
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Auto-Submit: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706148}