Enable GPU support in MSAN builds

Don't want to test GPU with MSAN, but I'd like to make GPU support
required for DM and other internal tools.

Bug: skia:
Change-Id: I5f1a7669242be9767aa3b579b39740a1741977f3
Reviewed-on: https://skia-review.googlesource.com/131143
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed