Roll external/skia a81c2be75..67eac38e6 (8 commits)

https://skia.googlesource.com/skia.git/+log/a81c2be75..67eac38e6

2018-08-29 skcms-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com Roll skia/third_party/skcms 5f03dc9abfb1..da25e1a6d412 (1 commits)
2018-08-29 bsalomon@google.com Temporarily make SkTMultiMap::remove() safe for values not in map
2018-08-29 kjlubick@google.com Correct LottieWeb drawing params
2018-08-29 reed@google.com textonpath no longer in canvas
2018-08-29 michaelludwig@google.com Add setXi and setXiv in GrGLSLProgramDataManager.
2018-08-29 kjlubick@google.com [PathKit] Make pathops assertion a little more forgiving
2018-08-29 brianosman@google.com Remove unused onCanLazyGenerateOnGPU function
2018-08-29 reed@google.com Revert "fix g3 by adding legacy flag"

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Change-Id: I4e5a7aa931d10873d7f24c514f0ed6536c709b27
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