Roll external/skia 61ffd53a9..b49d7b011 (5 commits)
https://skia.googlesource.com/skia.git/+log/61ffd53a9..b49d7b011
2017-11-07 liyuqian@google.com This is a reland of 67340. This CL fixes the broken layout tests by preserving the containedInClip boolean. We will eventually remove it and rebaseline the layout tests.
2017-11-07 csmartdalton@google.com Fix dangling pointers when Ganesh culls CCPR Ops early
2017-11-07 bsalomon@google.com Make GrAtlasTextBlob return to caller when a flush is required during subrun tessellation.
2017-11-07 rmistry@google.com Add section for how to connect to Skia swarming bots
2017-11-07 csmartdalton@google.com Add clipping options to path text bench and samples
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Change-Id: Ia5fc3396761cfe7f508a55d08cddf3decf1d9c89
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