Roll src/third_party/skia/ 1e74cad9b..0ab977f23 (4 commits).

https://skia.googlesource.com/skia.git/+log/1e74cad9b4ed..0ab977f2314d

$ git log 1e74cad9b..0ab977f23 --date=short --no-merges --format='%ad %ae %s'
2017-01-09 bungeman Remove SkUseTestFontConfigFile.
2017-01-09 brianosman Add Gray8 pixel config
2017-01-09 robertphillips Start making texture coordinates be absolute
2017-01-09 mtklein SkSplicer: start on arm64

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/2621053002
Cr-Commit-Position: refs/heads/master@{#442624}

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': '1e74cad9b4ed8079433d4e62ab3198d97436f5ec',
+  'skia_revision': '0ab977f2314d0b5ec0067fb5d6ececc21de6d2ab',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.