Roll external/skia 5ea41fc89..cfe1264d7 (1 commits)

https://skia.googlesource.com/skia.git/+log/5ea41fc89..cfe1264d7

2018-09-26 senorblanco@chromium.org GrTessellator: two fixes for boundary simplification artifacts.

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Change-Id: Ieb508b513589d0c5a2dab2633afe4ebc6231b9c9
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