Roll src/third_party/skia/ a76f6161f..56a4a099e (1 commit)

https://skia.googlesource.com/skia.git/+log/a76f6161f1c2..56a4a099e707

$ git log a76f6161f..56a4a099e --date=short --no-merges --format='%ad %ae %s'
2018-02-12 liyuqian Add init-once to threaded backend

Created with:
  roll-dep src/third_party/skia


The AutoRoll server is located here: https://autoroll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=caryclark@chromium.org

Change-Id: I30debaabfdbe13743cfb47195188671c3f719b60
Reviewed-on: https://chromium-review.googlesource.com/912521
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#536042}

DEPS

@@ -79,7 +79,7 @@ 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': 'a76f6161f1c2640302bb5fb1371b2ac14cf5c6d7',
+  'skia_revision': '56a4a099e707b2d556f4e39605b72fe8b8cde6f8',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.