Roll src/third_party/skia/ ee3e0bacc..83d118550 (4 commits)

https://skia.googlesource.com/skia.git/+log/ee3e0bacc8be..83d118550f72

$ git log ee3e0bacc..83d118550 --date=short --no-merges --format='%ad %ae %s'
2017-07-13 ethannicholas converted CircleEffect to SkSL
2017-07-13 fmalita Delete unread SkPicture mbox
2017-07-13 bsalomon Move GrAALinearizingConvexPathRenderer off GrLegacyMeshDrawOp
2017-07-13 egdaniel Add support for creating a GrContext backed by Metal.

Created with:
  roll-dep src/third_party/skia


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;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;master.tryserver.chromium.android:android_optional_gpu_tests_rel
TBR=ethannicholas@chromium.org

Change-Id: I1c4299ac66aa68f14c8c48a83bd2aa85c2d82f0e
Reviewed-on: https://chromium-review.googlesource.com/570994Reviewed-by: Skia Deps Roller <skia-deps-roller@chromium.org>
Commit-Queue: Skia Deps Roller <skia-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486683}

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': 'ee3e0bacc8bedd1e3ebfb52fbc8b1cc3ccdad358',
+  'skia_revision': '83d118550f7237d25e7e096cc968dbb9a06678a3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.