Roll src/third_party/skia/ 3b3bdafa8..941e7e2c9 (7 commits).

https://skia.googlesource.com/skia.git/+log/3b3bdafa8e3a..941e7e2c9567

$ git log 3b3bdafa8..941e7e2c9 --date=short --no-merges --format='%ad %ae %s'
2016-12-12 ethannicholas re-land of added sk_FragCoord support to skslc
2016-12-13 borenet Add PDFium_SkiaPaths bot
2016-12-13 reed don't use deprecated api
2016-12-12 scroggo SkGifCodec: intersect frameRect with image size
2016-12-12 msarett Fix Android overdraw detection
2016-12-12 borenet Roll recipe DEPS
2016-12-13 reed remove old clipping flags

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=msarett@google.com

Review-Url: https://codereview.chromium.org/2569843003
Cr-Commit-Position: refs/heads/master@{#438181}

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': '3b3bdafa8e3ac9421d895b1b978a148ed010de71',
+  'skia_revision': '941e7e2c9567ab1d8a3b2d1b0e3db71ee5eb75c9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.