Roll src/third_party/skia 581108137b46..8c1e0effbbe1 (4 commits)

https://skia.googlesource.com/skia.git/+log/581108137b46..8c1e0effbbe1

git log 581108137b46..8c1e0effbbe1 --date=short --no-merges --format='%ad %ae %s'
2019-11-12 mtklein@google.com sketch out structure for ops with immediates
2019-11-12 mtklein@google.com implement assert_true on x86
2019-11-12 mtklein@google.com add Release SkVMBlitter bot
2019-11-12 robertphillips@google.com Remove final usage of GrProgramDesc's header

Created with:
  gclient setdep -r src/third_party/skia@8c1e0effbbe1

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 halcanary@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=halcanary@google.com

Bug: None
Change-Id: I7aa576f2288c0967c7adca7f312e82a431f041fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912775Reviewed-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@{#714708}

DEPS

@@ -168,7 +168,7 @@ 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': '581108137b46307b521448bf987bb5e5ecf3e5dd',
+  'skia_revision': '8c1e0effbbe1cf87e1f0d7aa8cb22e04ec6728e5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.