Roll src/third_party/skia/ f8d4d5c99..6df611574 (2 commits).
Roll src/third_party/skia/ f8d4d5c99..6df611574 (2 commits).

https://chromium.googlesource.com/skia.git/+log/f8d4d5c995ca..6df611574a3c

$ git log f8d4d5c99..6df611574 --date=short --no-merges --format='%ad %ae %s'
2016-01-04 caryclark handle halfway case in scan converter
2016-01-04 reed remove now defunct get_paint_offset

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

Review URL: https://codereview.chromium.org/1556203002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#367453}

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