Roll Skia from 4aca9066d548 to 64aa5138c75f (3 revisions)

https://skia.googlesource.com/skia.git/+log/4aca9066d548..64aa5138c75f

2020-06-04 herb@google.com Remove SkAtlasTextTarget
2020-06-04 mtklein@google.com finish new-style opts
2020-06-04 ethannicholas@google.com Revert "Reland "Revert "Omit dead SkSL functions"""

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 tdenniston@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: tdenniston@google.com
Change-Id: I395b8ccd26d2f8690d3698d7726b973017d086ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229981Reviewed-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@{#774990}

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': '4aca9066d548c8d111fc800664b6a811a4273a39',
+  'skia_revision': '64aa5138c75fc41376c25f90ccddaf111d6ec631',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.