Roll external/skia 8e200787b..f4a5fc7af (1 commits)

https://skia.googlesource.com/skia.git/+log/8e200787b..f4a5fc7af

2017-06-06 borenet@google.com Use chrome-infra Git CIPD package

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Change-Id: I6851fcc53381c5a6f2bd2e6c12c4eed071f767fd