Roll src/third_party/skia/ e848ff596..56fbbfe60 (8 commits).
Roll src/third_party/skia/ e848ff596..56fbbfe60 (8 commits).

https://chromium.googlesource.com/skia.git/+log/e848ff59651e..56fbbfe609ba

$ git log e848ff596..56fbbfe60 --date=short --no-merges --format='%ad %ae %s'
2015-12-18 scroggo Reland of Add test for previously unflattenables (patchset #1 id:1 of https://codereview.chromium.org/1532753002/ )
2015-12-18 joshualitt Add visualbench as valid target to Makefile
2015-12-18 reed change signature for virtual related to saveLayer, passing SaveLayerRec
2015-12-18 caryclark fix large dashed paths
2015-12-18 scroggo Remove SkImageMinRowBytes
2015-12-18 joshualitt Blacklist GLPrograms on Angle Debug bot
2015-12-18 scroggo Update dm_flags.json to match dm_flags.py
2015-12-18 joshualitt Revert of Add config options to run different GPU APIs to dm and nanobench (patchset #18 id:340001 of https://codereview.chromium.org/1490113005/ )

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=joshualitt@google.com

Review URL: https://codereview.chromium.org/1539923002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#366111}

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