Roll src/third_party/skia/ 52ab2f5df..2afffbda6 (1 commit).

https://skia.googlesource.com/skia.git/+log/52ab2f5df17c..2afffbda66cd

$ git log 52ab2f5df..2afffbda6 --date=short --no-merges --format='%ad %ae %s'
2016-12-05 mtklein Remove redundant -GN bot suffixes.

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=herb@google.com

Review-Url: https://codereview.chromium.org/2551033004
Cr-Commit-Position: refs/heads/master@{#436502}

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': '52ab2f5df17c953dc673954e427fc1aa1a5fe48e',
+  'skia_revision': '2afffbda66cd24c8559a62f59ee608096813b2bb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.