Roll external/skia 1720067c1..1958fbbcf (7 commits)
https://skia.googlesource.com/skia.git/+log/1720067c1..1958fbbcf
2019-06-27 brianosman@google.com Revert "DM: Add a per-sink MemoryCache to all GPU sinks"
2019-06-27 mtklein@google.com Reland "add operator "" _mask() to make Assembler clearer"
2019-06-27 bsalomon@google.com constexprify a lot of GrTypesPriv.h
2019-06-27 mtklein@google.com make Label offsets int
2019-06-27 benjaminwagner@google.com Update driver on Ubuntu18 Quadro bots
2019-06-27 brianosman@google.com DM: Add a per-sink MemoryCache to all GPU sinks
2019-06-27 fmalita@chromium.org [skottie] Divide-by-zero in CameraAdapter::totalMatrix()
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Change-Id: I54789053baf43df86e81c1abd19adb3f99f0e259
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