Roll Skia from f7005498d416 to 4ca8884a02fa (3 revisions)

https://skia.googlesource.com/skia.git/+log/f7005498d416..4ca8884a02fa

2020-06-10 johnstiles@google.com Update GrRRectBlurEffect to use a child FP.
2020-06-10 johnstiles@google.com Reland "Update GrCircleBlurFragmentProcessor to use a child FP."
2020-06-10 brianosman@google.com Reland "Switch persistent cache to use SkReadBuffer/SkWriteBuffer"

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 bungeman@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: bungeman@google.com
Change-Id: I47a91ad3e89fea5fe7721a8ea3196afa7ca08c40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2239986Reviewed-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@{#777016}

DEPS

@@ -182,7 +182,7 @@ 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': 'f7005498d4166fd1544d2d43ba4d29e0db2d61a6',
+  'skia_revision': '4ca8884a02fa017c4dd16f57e24eeef8966d79db',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.