Add stub gpu workaround generators

Like https://chromium-review.googlesource.com/c/chromium/src/+/1005362,
this patch adds a way for Chrome and Skia to share a set of driver
workaround names so that they can be turned on by Chrome (or Skia) as
needed.

To avoid weird cross-repository dependencies, the generator script is
duplicated in Skia.

This patch just adds a few dummy workaround names to make sure the build
process is working.  The followup to this is to add workaround init
to GrContext/GrContextOptions and to start implementing individual
workarounds.

Implementing these workarounds is to support Chrome's "out of process
raster" which will use Ganesh without a command buffer, and so will not
have the workarounds that the command buffer provides.

Bug: chromium:829614
Change-Id: I40745a777a95805995991fedb81657ae418b52d9
Reviewed-on: https://skia-review.googlesource.com/120608
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Adrienne Walker <enne@chromium.org>

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