Roll src/third_party/skia 37e7b36a3dc2..8a46f7664675 (4 commits)

https://skia.googlesource.com/skia.git/+log/37e7b36a3dc2..8a46f7664675

git log 37e7b36a3dc2..8a46f7664675 --date=short --first-parent --format='%ad %ae %s'
2020-01-29 kjlubick@google.com [canvaskit] Add demo for RT shader
2020-01-29 csmartdalton@google.com Add a "kSimpleInnerPolygons" mode to GrTessellator
2020-01-29 fmalita@chromium.org [skottie] Cleanup: convert shape stroke/fill to new adapter pattern
2020-01-29 bsalomon@google.com Check for valid stencil buffer in GrGLGpu::clearStencilClip

Created with:
  gclient setdep -r src/third_party/skia@8a46f7664675

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/+/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: chromium:984747
Tbr: reed@google.com
Change-Id: I2fdadd8f2fe2725433a19e262355f54a537ff6b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028655Reviewed-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@{#736577}

DEPS

@@ -177,7 +177,7 @@ 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': '37e7b36a3dc24c6547968ca1bc3e5e8b764bf176',
+  'skia_revision': '8a46f766467573dc44e866a66572cf2dfb6a0477',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.