Roll src/third_party/skia/ 2afffbda6..e7d34b1d2 (1 commit).

https://skia.googlesource.com/skia.git/+log/2afffbda66cd..e7d34b1d2c40

$ git log 2afffbda6..e7d34b1d2 --date=short --no-merges --format='%ad %ae %s'
2016-12-06 rmistry Do not checkout skia from chromium.googlesource.com in RecreateSKPs bot

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/2555723002
Cr-Commit-Position: refs/heads/master@{#436597}

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': '2afffbda66cd24c8559a62f59ee608096813b2bb',
+  'skia_revision': 'e7d34b1d2c4049a788d0bee4b93a7f11aab01ed2',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.