Roll Skia from 21bebc68fda6 to 215d2b0fa42d (2 revisions)

https://skia.googlesource.com/skia.git/+log/21bebc68fda6..215d2b0fa42d

2020-09-09 mtklein@google.com impl SkMulDiv255Round with SkMul16ShiftRound
2020-09-09 bsalomon@google.com Revert "Perf bot experiment, disable GLSL integers on ANGLE ES3"

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 reed@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: reed@google.com
Change-Id: I45d336ed69a11c8f2306a0b7e5c4a5dece6a34a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401858Reviewed-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@{#805415}

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': '21bebc68fda61b4dedf7441942f3d6c160510a5f',
+  'skia_revision': '215d2b0fa42d523ac8c6d262e1cd6c7dc27976b6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.