Roll Skia from db2dad5c644f to f4ea30580c91 (3 revisions)

https://skia.googlesource.com/skia.git/+log/db2dad5c644f..f4ea30580c91

2021-01-08 reed@google.com Revert "Cache ICU break iterators in SkUnicode_icu"
2021-01-08 reed@google.com Always lerp when post-rotating tile in pictureshader
2021-01-08 csmartdalton@google.com Make Comparator& refs in GrTriangulator const

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 johnstiles@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: johnstiles@google.com
Change-Id: I98d0ab1e5179ce43b07da8f10853dcb351dd528b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617207Reviewed-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@{#841360}

DEPS

@@ -199,7 +199,7 @@ 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': 'db2dad5c644f5a57059ef57483d52090f0e3c0c9',
+  'skia_revision': 'f4ea30580c91ec601ea1038030bdb257a73241c2',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.