Roll src/third_party/skia a1991f5e3b58..620154a7dc5c (5 commits)

https://skia.googlesource.com/skia.git/+log/a1991f5e3b58..620154a7dc5c

git log a1991f5e3b58..620154a7dc5c --date=short --no-merges --format='%ad %ae %s'
2019-10-28 bsalomon@google.com Make GrFillInData use SkRasterPipeline
2019-10-28 egdaniel@google.com Reland "Revert "Rename gl_SampleMask to sk_SampleMask""
2019-10-28 michaelludwig@google.com Reland "Add variety of bulk API benchmarks"
2019-10-28 ethannicholas@google.com Revert "Revert "Rename gl_SampleMask to sk_SampleMask""
2019-10-28 bsalomon@google.com Remove legacy async read pixels APIs.

Created with:
  gclient setdep -r src/third_party/skia@620154a7dc5c

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 jcgregorio@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=jcgregorio@google.com

Bug: None
Change-Id: If5063597acc7f0ab8fe28bc32590a0f9d47d114b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884441Reviewed-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@{#710083}

DEPS

@@ -171,7 +171,7 @@ 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': 'a1991f5e3b58479372d7091d97611c5004585d68',
+  'skia_revision': '620154a7dc5cc77259cb38b8a5a83ad5b1c35851',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.