Roll src/third_party/skia 5a2ba9996b20..578c88f047ec (4 commits)

https://skia.googlesource.com/skia.git/+log/5a2ba9996b20..578c88f047ec

git log 5a2ba9996b20..578c88f047ec --date=short --no-merges --format='%ad %ae %s'
2019-09-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 0b8eca795349..f421e0e33e66 (6 commits)
2019-09-12 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-09-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 451d3245..4712e398 (443 commits)
2019-09-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader cebb9635a5d5..5a5ffe52a944 (4 commits)

Created with:
  gclient setdep -r src/third_party/skia@578c88f047ec

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 mtklein@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=mtklein@google.com

Bug: chromium:None,chromium:None,chromium:None
Change-Id: Iaef50aaba3da98bd98d36bb06d46153c65180370
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800064Reviewed-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@{#695947}

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': '5a2ba9996b2098f828743eb7fd66c51938f080eb',
+  'skia_revision': '578c88f047ec70174bc1ea8ebcb39ce7819478aa',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.