Roll external/skia 2213ee94c..b5ba83993 (19 commits)

https://skia.googlesource.com/skia.git/+log/2213ee94c..b5ba83993

2018-10-02 mtklein@google.com Revert "Add GM for less common YUV formats"
2018-10-02 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 60be5c45fab2..75753f9f4c65 (1 commits)
2018-10-02 herb@google.com Reland "Remove obsolete paint copy"
2018-10-02 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 16c20140e05e..df836ff8f17d (12 commits)
2018-10-02 brianosman@google.com Remove unused premul/unpremul FP code
2018-10-02 mtklein@google.com Revert "Remove obsolete paint copy"
2018-10-02 robertphillips@google.com Add GM for less common YUV formats
2018-10-02 mtklein@google.com cleanup SkColorSpace API and members
2018-10-02 mtklein@google.com Reland "clamp gamut if needed in SkConvertPixels"
2018-10-02 fmalita@chromium.org [skottie] External logger support
2018-10-02 csmartdalton@google.com ccpr: Fix the path cache on Android framework
2018-10-02 mtklein@google.com Revert "Always include public/include headers for vulkan and just guard src files with SK_VULKAN."
2018-10-02 kjlubick@google.com Fix text on CanvasKit
2018-10-02 mtklein@google.com Revert "clamp gamut if needed in SkConvertPixels"
2018-10-02 egdaniel@google.com Always include public/include headers for vulkan and just guard src files with SK_VULKAN.
2018-10-02 jvanverth@google.com Add some checks to GrDashOp
2018-10-02 bsalomon@google.com Don't crash in aaflags GM if context is abandoned
2018-10-02 fmalita@chromium.org [sksg] Fix inval tracking in Group::removeChild()
2018-10-02 herb@google.com Remove obsolete paint copy

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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Change-Id: I46772e1ad493b19b1b101bac3025007f8ddafc17
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