Roll src/third_party/skia ac8a16ca5200..7823aeb8d6da (3 commits)

https://skia.googlesource.com/skia.git/+log/ac8a16ca5200..7823aeb8d6da

git log ac8a16ca5200..7823aeb8d6da --date=short --no-merges --format='%ad %ae %s'
2019-10-31 halcanary@google.com refactor/layering: SkMalloc.cpp
2019-10-31 mtklein@google.com only scale shader by paint alpha < 1
2019-10-31 mtklein@google.com fix uniform buffer size, scale by paint alpha

Created with:
  gclient setdep -r src/third_party/skia@7823aeb8d6da

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: I2115455eb31c8ada8191ee5e90c02c5cd5d32abc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893817Reviewed-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@{#711397}

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': 'ac8a16ca5200d3a03b911fcfd61a732c06e45aa4',
+  'skia_revision': '7823aeb8d6da204568fe3c54683da5f3fc4f0d16',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.