Roll external/skia a062258e7..6feb69123 (5 commits)
https://skia.googlesource.com/skia.git/+log/a062258e7..6feb69123
2017-06-30 ethannicholas@google.com SPIR-V comma operator support
2017-06-30 wutao@google.com Added new edge handling mode (clamp and repeat) to Gaussian blur filter.
2017-06-30 fmalita@chromium.org Delete non-raster-pipeline SkTwoPointConicalGradient impl
2017-06-30 mtklein@chromium.org clean up GCC 6.3 workaround
2017-06-30 halcanary@google.com SkPDF: simplify SkPDFGraphicState
Test: Presubmit checks will test this change.
Change-Id: Ica08020dd722830daec583f7094cab3611ac2a45