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This is essentially a debugging hack - we know that windowserver
crashes on the bots are caused by CoreGraphics trying to software-
composite shadows from a window layer, and we know that these crashes
only happen on VMWare bots.

Bug: 899286
Change-Id: I531e6008ca30978dfb0f97562387af58cb53dd92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1976016Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728531}