Roll src/third_party/skia/ c601698f9..f4faccd3b (2 commits).

https://skia.googlesource.com/skia.git/+log/c601698f9bf5..f4faccd3b303

$ git log c601698f9..f4faccd3b --date=short --no-merges --format='%ad %ae %s'
2017-01-10 brianosman Fix overwriting of config flags in a few cases
2017-01-11 liyuqian Revert "Revert "Improve quad edges' smoothness in non-AA cases""

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=kjlubick@google.com

Review-Url: https://codereview.chromium.org/2622133003
Cr-Commit-Position: refs/heads/master@{#442910}

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': 'c601698f9bf5b6cd75e712fc9d7fe142295b2d35',
+  'skia_revision': 'f4faccd3b303cd21b6cd3d7b1a54d2b5f0c6f079',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.