Roll Skia from 64f3530dc37e to 398ecf1876f1 (4 revisions)

https://skia.googlesource.com/skia.git/+log/64f3530dc37e..398ecf1876f1

2020-08-26 egdaniel@google.com Remove unused factories that take characterizations.
2020-08-26 bsalomon@google.com Enable glesfakev2 config on Android perf bots
2020-08-26 bungeman@google.com Format and comment SkScalarInterpFunc
2020-08-26 bsalomon@google.com Add config "glesfakev2". It runs GLES with the version faked as 2.

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 mtklein@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: mtklein@google.com
Change-Id: Ie693311df982ae034bb444c2fc94c1fcd68dc11c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378656Reviewed-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@{#802028}

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': '64f3530dc37ed6ab944b280177f81bd6c286df23',
+  'skia_revision': '398ecf1876f13ffb7911fbf5b800cca8d4e8f90c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.