Roll Skia from 90b027a36b4c to 4ef21edffb35 (5 revisions)

https://skia.googlesource.com/skia.git/+log/90b027a36b4c..4ef21edffb35

2020-09-02 robertphillips@google.com Split creation of integral table out of GrRectBlurEffect
2020-09-02 johnstiles@google.com Disallow inlining ternary true/false branches.
2020-09-02 johnstiles@google.com Add unit tests for the inliner.
2020-09-02 mtklein@google.com skvx spring cleaning
2020-09-02 robertphillips@google.com Split up find_or_create_rrect_blur_mask_fp

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 michaelludwig@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:1108408
Tbr: michaelludwig@google.com
Change-Id: I10e3e19996db88b57403f6fad6d0722e0f20dc81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390985Reviewed-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@{#803950}

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': '90b027a36b4c944f0b86d1bed94204dab7ea0567',
+  'skia_revision': '4ef21edffb358b5a7f6d8904175cc2154004a556',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.