Roll src/third_party/skia/ 3f375d055..7cf774573 (1 commit).

https://skia.googlesource.com/skia.git/+log/3f375d055a9b..7cf774573cc5

$ git log 3f375d055..7cf774573 --date=short --no-merges --format='%ad %ae %s'
2016-12-28 kjlubick update pixel and pixelxl to NMF26Q

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

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
TBR=liyuqian@google.com

Review-Url: https://codereview.chromium.org/2608523002
Cr-Commit-Position: refs/heads/master@{#440885}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '3f375d055a9bf167122a5bbf4db9753f4b46a781',
+  'skia_revision': '7cf774573cc5bc7e588ed4489d0a4127e9edf0cc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.