Roll src/third_party/skia 4ece96d76d9d..8ef18d359b26 (3 commits)

https://skia.googlesource.com/skia.git/+log/4ece96d76d9d..8ef18d359b26

git log 4ece96d76d9d..8ef18d359b26 --date=short --no-merges --format='%ad %ae %s'
2019-08-30 dragonbear@google.com Override operator delete for GrCCPathCache::Key
2019-08-30 egdaniel@google.com Just skip uninstantiated GrOps instead of delete them on flush.
2019-08-30 brianosman@google.com Pass SkPaint by const-ref to SkParticleDrawable

Created with:
  gclient setdep -r src/third_party/skia@8ef18d359b26

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC stani@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=stani@google.com

Bug: None
Change-Id: I8265a37f804c83d7bf77d2d52491c3395bbb0378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779382Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#692250}

DEPS

@@ -162,7 +162,7 @@ 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': '4ece96d76d9d20c3fbe77e9a78829af8ef007fe7',
+  'skia_revision': '8ef18d359b2666828957c4c6f03f2ddfa8ce266c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.