Roll external/skia 035671491..64dbb89ef (1 commits)

https://skia.googlesource.com/skia.git/+log/035671491..64dbb89ef

2017-05-04 senorblanco@chromium.org GrTessellator: fix for vertex coincident with enclosing edge.

Test: Presubmit checks will test this change.
Change-Id: I878a1e091528d76e4c054cc30ab813495a0c3a7f