Roll external/skia d81977f51..dcbb9d90d (9 commits)
https://skia.googlesource.com/skia.git/+log/d81977f51..dcbb9d90d
2017-07-19 bsalomon@google.com Add SkDebugf trace event handler.
2017-07-19 ethannicholas@google.com fixed SPIR-V int->uint conversion
2017-07-19 bsalomon@google.com Remove GrAnalyticRectOp, the last legacy GrMeshDrawOp
2017-07-19 reed@google.com experimental: draw into unpremul
2017-07-19 reed@google.com remove google3 colortable flag
2017-07-19 fmalita@chromium.org Singleton SRGB color filters
2017-07-19 egdaniel@google.com Add blacklist to vk win intel for skp
2017-07-19 halcanary@google.com SkPDF: Fix color glyphs with absolute positioning
2017-07-19 scroggo@google.com Report first GIF frame after knowing its meta data
Test: Presubmit checks will test this change.
Change-Id: Id09ea7b1012456f22e5f6518790680e4d03b7f68