Roll external/skia 93d0146dc..10e259e95 (5 commits)

https://skia.googlesource.com/skia.git/+log/93d0146dc..10e259e95

2019-06-06 egdaniel@google.com Fix vulkan async transfer from call to not submit command buffer to early.
2019-06-06 ethannicholas@google.com Major rearchitecture of SkSL parsing, focused on improving performance.
2019-06-06 egdaniel@google.com Reland "Remove support for copyAsDraw in gpu copySurface."
2019-06-06 fmalita@chromium.org [skottie] Add support for RangeSelector shapes
2019-06-06 bungeman@google.com Fix GrBackendRenderTarget and GrBackendTexture operator=

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Change-Id: Ica469aada2ca425fee730403eeeb5ef133b8f4e8
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