Roll src/third_party/skia/ 45aac57ac..019be7b47 (2 commits).

https://skia.googlesource.com/skia.git/+log/45aac57ac619..019be7b472a5

$ git log 45aac57ac..019be7b47 --date=short --no-merges --format='%ad %ae %s'
2016-12-07 mtklein add missing []
2016-12-07 xiangze.zhang Add AVX2 version of ConvolveVertically

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/2553013005
Cr-Commit-Position: refs/heads/master@{#437176}

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': '45aac57ac6195880930441656a0988453f16c3db',
+  'skia_revision': '019be7b472a5a628e54822bddaa101fcda49da93',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.