Roll src/third_party/skia a37ea9246e1e..37cb2b2a47f0 (3 commits)

https://skia.googlesource.com/skia.git/+log/a37ea9246e1e..37cb2b2a47f0

git log a37ea9246e1e..37cb2b2a47f0 --date=short --no-merges --format='%ad %ae %s'
2019-09-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src c6edebc2..b1c1d284 (382 commits)
2019-09-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 30847688f059..61a2765940a7 (7 commits)
2019-09-18 herb@google.com Revert "SkZip - synchronized indexing of several pointers"

Created with:
  gclient setdep -r src/third_party/skia@37cb2b2a47f0

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: chromium:None,chromium:None
Change-Id: Ie5408a899495ee583d742a659b2fbb2139ce7f99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810457Reviewed-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@{#697503}

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': 'a37ea9246e1e917eafb43ba3880220db26ceb5d9',
+  'skia_revision': '37cb2b2a47f0ec36186eef2d60a2445f7dd633ef',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.