Roll src/third_party/skia/ 6b4898433..7471c780d (1 commit).
Roll src/third_party/skia/ 6b4898433..7471c780d (1 commit).

https://chromium.googlesource.com/skia.git/+log/6b4898433302..7471c780d48a

$ git log 6b4898433..7471c780d --date=short --no-merges --format='%ad %ae %s'
2016-02-04 ethannicholas JSON API cleanups GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1664263002

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

Review URL: https://codereview.chromium.org/1664323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#373596}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk