Roll Skia from 866d2894ebd1 to 5cfa7194d55e (4 revisions)

https://skia.googlesource.com/skia.git/+log/866d2894ebd1..5cfa7194d55e

2020-08-17 nigeltao@google.com Drop support for Wuffs v0.2
2020-08-17 johnstiles@google.com Simplify SkSL::String by removing unused parts.
2020-08-17 reed@google.com Migrate to using SkPathBuilder
2020-08-17 robertphillips@google.com Better encapsulate the GrDrawOpAtlas w/in the GrSmallPathAtlasMgr

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 stani@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: stani@google.com
Change-Id: I9dc02d126f35440c23f1d537c54aae16b89b4f1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360215Reviewed-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@{#798700}

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': '866d2894ebd155ef0af57bb88aab00fa375390e0',
+  'skia_revision': '5cfa7194d55e066477524b9edeacae9f6f2f758c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.