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The GPU workaround wasn't being passed to Skia when running with Vulkan.
In general, GPU workarounds aren't implemented for Vulkan so remove the
GPU workaround and add a real flag. Set the GrContextOption based on the
flag from GetDefaultGrContextOptions() so it's picked up everywhere.

Bug: 1138979
Change-Id: I469a7b38517e62f0577673ac1b8c1430fee9f55a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502952Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821344}