Roll Skia from b81fdbee92ce to 439af79f26e2 (3 revisions)

https://skia.googlesource.com/skia.git/+log/b81fdbee92ce..439af79f26e2

2020-10-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from afe6ca45b6da to 635de036d766 (3 revisions)
2020-10-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 77e3d0ae97b6 to 3df629c55d89 (20 revisions)
2020-10-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 4259b6b6 to 3c775217 (463 revisions)

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 jvanverth@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: jvanverth@google.com
Test: Test: Test: *debug_negative_coverage*
Change-Id: Ia1ced376b353b1fdbb10b3afdbdc6d766ca915f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2455286Reviewed-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@{#814576}

DEPS

@@ -195,7 +195,7 @@ 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': 'b81fdbee92ceeae4d345f9f844fe2dbbd82026a0',
+  'skia_revision': '439af79f26e2a7b29859c91e1b74d6e69339c013',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.