Roll src/third_party/skia 3f9199a162ff..ad994cd8941d (6 commits)

https://skia.googlesource.com/skia.git/+log/3f9199a162ff..ad994cd8941d

git log 3f9199a162ff..ad994cd8941d --date=short --first-parent --format='%ad %ae %s'
2019-12-10 egdaniel@google.com Store GrSurfaceProxyView on shadow ops.
2019-12-10 herb@google.com Put SubRuns in an alloc on GrTextBlob
2019-12-10 fmalita@chromium.org [skottie] Add frame time histogram to SkottieSlide UI
2019-12-10 jlavrova@google.com Font features
2019-12-10 fmalita@chromium.org [skottie] Initial SkottieSlide UI
2019-12-10 halcanary@google.com utils/mac/SkCreateCGImageRef: cleanup

Created with:
  gclient setdep -r src/third_party/skia@ad994cd8941d

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 djsollen@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:1029972
Tbr: djsollen@google.com
Change-Id: I547e84ac1af74a5449142a7ce0f669ea0549430e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960772Reviewed-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@{#723566}

DEPS

@@ -172,7 +172,7 @@ 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': '3f9199a162ff70503187efb9ca150ad0a387315d',
+  'skia_revision': 'ad994cd8941dfcb4c30ef7b58a40fb351c0e938f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.