Roll Skia from 3d921f1b2c56 to e96cdd18ac5f (7 revisions)

https://skia.googlesource.com/skia.git/+log/3d921f1b2c56..e96cdd18ac5f

2020-09-28 ethannicholas@google.com moved SkSL IntLiteral data into IRNode
2020-09-28 johnstiles@google.com Remove fKind field from BasicBlock::Node.
2020-09-28 herb@google.com air gap SkStrikeServer API from implementation
2020-09-28 ethannicholas@google.com moved SkSL DoStatement's data into IRNode
2020-09-28 jvanverth@google.com Add deprecation warning when running Metal on older OSes.
2020-09-28 bsalomon@google.com Work around python 2 shutil.copy2 date bug
2020-09-28 egdaniel@google.com Fix offscreen drawing when cleaning up vulkan viewer.

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 brianosman@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: brianosman@google.com
Change-Id: I41d4b21227a026f7543f788b5951db4d051a31d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437096Reviewed-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@{#811573}

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': '3d921f1b2c56b3e9de7d08a2dd54f6c9b612351e',
+  'skia_revision': 'e96cdd18ac5ff04774b55775bf66f1f3ccbe4d62',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.