Roll Skia from 4ed6947787e7 to ab6f9ef34a2b (5 revisions)

https://skia.googlesource.com/skia.git/+log/4ed6947787e7..ab6f9ef34a2b

2020-08-11 mtklein@google.com don't use out of range float values in the test
2020-08-11 mtklein@google.com allow all CPU surfaces
2020-08-11 bsalomon@google.com Check for OOM in GrVkMemory
2020-08-11 michaelludwig@google.com Don't over simplify near-colinear vertices
2020-08-11 jlavrova@google.com Revert "ICU: SkShaper (bidi iterator only)"

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 fmalita@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: chromium:1086705,chromium:1113777
Tbr: fmalita@google.com
Change-Id: I657954a4057e8e2982b0a1db29598e9027fe3bbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350554Reviewed-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@{#797119}

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': '4ed6947787e7587995dbda777cd44031c59d11ad',
+  'skia_revision': 'ab6f9ef34a2b116c6f64bf3b89d174fbce574fab',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.