Roll external/skia 5bf5a64fe..b3d2760e2 (1 commits)

https://skia.googlesource.com/skia.git/+log/5bf5a64fe..b3d2760e2

2018-11-16 scroggo@google.com Add safety net logging for issue 118143775

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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Bug: 118143775
Change-Id: I4e5122a7b4a65f5ab93cfc0bca3a6f298a6189ae