Roll Skia from 15d8174fc944 to 530933006d3c (2 revisions)

https://skia.googlesource.com/skia.git/+log/15d8174fc944..530933006d3c

2020-10-23 johnstiles@google.com Add unit test demonstrating recursion codegen bug.
2020-10-23 johnstiles@google.com Fix use-after-free discovered by fuzzer.

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 egdaniel@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: egdaniel@google.com
Change-Id: I7eaee3483812115ed06f9f6a5803ab774bbfd9e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495683Reviewed-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@{#820352}

DEPS

@@ -206,7 +206,7 @@ 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': '15d8174fc94492485552f9729508a4bfb32320a0',
+  'skia_revision': '530933006d3cb9ba1fcbfd32d5495390dc0c23d6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.