Roll src/third_party/skia/ 249ee1f98..5a9a981ed (5 commits)

https://skia.googlesource.com/skia.git/+log/249ee1f985b4..5a9a981edf54

$ git log 249ee1f98..5a9a981ed --date=short --no-merges --format='%ad %ae %s'
2017-08-01 fmalita Tiling support for SkSweepGradient
2017-08-01 bsalomon Make ProcessorCloneTest more robust, fix matrix conv. onIsEqual
2017-08-01 robertphillips Fix cleanup on program creation failure
2017-08-01 ethannicholas Revert "support for 'half' types in sksl, plus general numeric type improvements"
2017-08-01 ethannicholas fixed missing INT_MAX definition

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=liyuqian@chromium.org

Change-Id: I43efa8eeb5e612e3ce9bcbae3d90bbcdb58efa2a
Reviewed-on: https://chromium-review.googlesource.com/597011Reviewed-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@{#491165}

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': '249ee1f985b4bad78db2d5cfdd14ce38edb2c23a',
+  'skia_revision': '5a9a981edf54d203e06adab0909da03343a1c596',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.