[manifest] Roll skia 80c6909bf..294861ff9 (1 commits)

https://skia.googlesource.com/skia.git/+log/80c6909bf..294861ff9

2018-10-22 bsalomon@google.com zero-init preallocated vertex/index space in drawing manager


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

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TEST=CQ

Change-Id: I63dc994f02d95f753129564078f430b5276339f6
1 file changed