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We have rounded corners on the shelf to clip the ink-drop effect,
this causes an additional renderpass. We added an InkDropObserver
to listen for the ink drop animation starting and ending and
toggle the rounded corners as needed.

Bug: 1021772
Change-Id: Icf4aafa6ddb1d917ec8ae07b68fb4063b0b6c995
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001745Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735063}