Roll Skia from 39d1c1ebb607 to 620bfa3fffba (2 revisions)

https://skia.googlesource.com/skia.git/+log/39d1c1ebb607..620bfa3fffba

2020-07-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 12c9d4ac61f2 to dc8e77f0e521 (6 revisions)
2020-07-28 reed@google.com remove (unused) DirectTo... methods

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 borenet@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
Bug: None
Tbr: borenet@google.com
Change-Id: I0ca4f7ff6a0c3970f209c0ac8f7d569738b87c69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325558Reviewed-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@{#792598}

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': '39d1c1ebb60789f43095e994462c54dc6483caad',
+  'skia_revision': '620bfa3fffba0f9ab97009d707c3ff52b1373d59',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.