[manifest] Roll skia 928db927f..c96bf2f64 (2 commits)

https://skia.googlesource.com/skia.git/+log/928db927f..c96bf2f64

2018-10-17 nigeltao@google.com Rename EncoderBench.cpp to EncodeBench.cpp
2018-10-17 mtklein@google.com clean up SK_LEGACY_4F_XFERMODES


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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
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TEST=CQ

Change-Id: I069ec105fb75e41163be5f8ce9c04da01ca6f2d2
1 file changed