Roll Skia from 6356cb1904b8 to 4f509345ab9f (3 revisions)

https://skia.googlesource.com/skia.git/+log/6356cb1904b8..4f509345ab9f

2021-01-05 reed@google.com Pass sampling to drawImageSet
2021-01-05 brianosman@google.com SkSL-to-SkVM: Misc fixes around arguments
2021-01-05 rmistry@google.com [recreateskps-bot] New locations for hosted pages

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 johnstiles@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/+doc/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
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: johnstiles@google.com
Change-Id: I6b4405627c67a8b3fb1e4c0099ad9317755768ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611816Reviewed-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@{#840374}

DEPS

@@ -199,7 +199,7 @@ 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': '6356cb1904b84dbda9941dd5668a3687bdde79a8',
+  'skia_revision': '4f509345ab9fcf02d1cc6736ecd588df3253f68d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.