Roll external/skia b3d2760e2..34dafd547 (7 commits)
https://skia.googlesource.com/skia.git/+log/b3d2760e2..34dafd547
2018-11-16 mtklein@google.com I think the _DXDY_ code may all be dead.
2018-11-16 michaelludwig@google.com Update threshold for degenerate gradients
2018-11-16 brianosman@google.com Use GrVertexWriter for GrRegionOp, add writeQuad()
2018-11-16 brianosman@google.com Do CCPR hairline coverage scaling in floats, rather than bytes
2018-11-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 44994a88c9cc..000df8b42041 (1 commits)
2018-11-16 herb@google.com Fun with flags
2018-11-16 csmartdalton@google.com sksl: Polyfill fma() when not present in GLSL
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Change-Id: Id0616e8fca2bf1ead872fbd8221e19669152da58
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