Roll Skia from 38688fcdba24 to cd74dfa47721 (2 revisions)

https://skia.googlesource.com/skia.git/+log/38688fcdba24..cd74dfa47721

2020-10-20 kjlubick@google.com [canvaskit] Add test harness for running all gms and getting output
2020-10-20 kjlubick@google.com [canvaskit] Make gm test wrapper not omit known pngs

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: If53043bb48d9d6e1f70bc424f6cb48806c44feb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487141Reviewed-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@{#818895}

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': '38688fcdba24dcc2100b5f888c5c5a90226e2267',
+  'skia_revision': 'cd74dfa477216defe814a1aa9f238f9c20861244',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.