Roll Skia from 4ef108e6d17a to 6d4577bc5208 (2 revisions)

https://skia.googlesource.com/skia.git/+log/4ef108e6d17a..6d4577bc5208

2020-12-30 westont@google.com [fuzzing] Add first pass SkParagraph fuzzing.
2020-12-30 brianosman@google.com Revert "SkRuntimeEffect: Test matrix inverse() intrinsic"

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 djsollen@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: djsollen@google.com
Change-Id: Ie85488be6d7f53a9777444dfea23cf0399a18309
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607577Reviewed-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@{#839800}

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': '4ef108e6d17ae4242c9538a3f99677e03c1ff667',
+  'skia_revision': '6d4577bc520866b97ef3f03b1abe91fee1232ce0',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.