Roll src/third_party/skia 8391bac5c6f0..17a3a0bda946 (2 commits)

https://skia.googlesource.com/skia.git/+log/8391bac5c6f0..17a3a0bda946

git log 8391bac5c6f0..17a3a0bda946 --date=short --no-merges --format='%ad %ae %s'
2019-09-18 robertphillips@google.com Last tranche of new SkColorTypes
2019-09-18 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@17a3a0bda946

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/+/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
TBR=brianosman@google.com

Bug: None
Change-Id: Iea704ae2d3de29ea0b31724aa46d7a2e1bacb421
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811463Reviewed-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@{#697765}

DEPS

@@ -162,7 +162,7 @@ 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': '8391bac5c6f07fd01e78cc140b01119de73a749d',
+  'skia_revision': '17a3a0bda946b807a6b9003b0062cc5855a76127',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.