Roll src/third_party/skia 23d978da38f9..52037e8ecce6 (2 commits)

https://skia.googlesource.com/skia.git/+log/23d978da38f9..52037e8ecce6

git log 23d978da38f9..52037e8ecce6 --date=short --first-parent --format='%ad %ae %s'
2020-02-28 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 4d40271e3f09..05f5e0b34ac8 (3 commits)
2020-02-28 herb@google.com Add LLVM floor code for SkVM

Created with:
  gclient setdep -r src/third_party/skia@52037e8ecce6

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 jlavrova@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/+/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: jlavrova@google.com
Change-Id: Ide1092bee040d778fa22938ecca60f256ee23607
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080031Reviewed-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@{#745378}

DEPS

@@ -175,7 +175,7 @@ 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': '23d978da38f94dc430367778b91cbbdd9c96ac5d',
+  'skia_revision': '52037e8ecce672a000309ba121b0d62d37f8b65b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.