Roll external/skia cf75b00ff..43344289f (2 commits)

https://skia.googlesource.com/skia.git/+log/cf75b00ff..43344289f

2017-08-16 mtklein@chromium.org cut down GrShapeTest stack usage
2017-08-16 stani@google.com Add additional logging in GrRenderTargetOpList

Test: Presubmit checks will test this change.
Change-Id: Ia8ca9880ab331c16fd581852390fb9de6f25050f