Roll src/third_party/skia/ 4c28a7423..c0b4d21e1 (1 commit).

https://skia.googlesource.com/skia.git/+log/4c28a7423332..c0b4d21e13b3

$ git log 4c28a7423..c0b4d21e1 --date=short --no-merges --format='%ad %ae %s'
2017-01-01 benjaminwagner Disable msaa on IntelIris540 (new 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=csmartdalton@google.com

Review-Url: https://codereview.chromium.org/2609723002
Cr-Commit-Position: refs/heads/master@{#441048}
diff --git a/DEPS b/DEPS
index 157c0dd..579194967 100644
--- a/DEPS
+++ b/DEPS
@@ -40,7 +40,7 @@
   # 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': '4c28a7423332e08ca4e0fcec4f4cd624f9fd66d7',
+  'skia_revision': 'c0b4d21e13b33b787f26f3f3aa9570e9ed782959',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.