Roll src/third_party/skia 981d590e8eba..78debd6f6d83 (5 commits)

https://skia.googlesource.com/skia.git/+log/981d590e8eba..78debd6f6d83

git log 981d590e8eba..78debd6f6d83 --date=short --first-parent --format='%ad %ae %s'
2020-04-27 johnstiles@google.com Reland "Add Abseil to third_party."
2020-04-27 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go Deps
2020-04-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 21c5af3151fb..3cb9c4bee9b3 (7 commits)
2020-04-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 132edc1c..9781ff27 (476 commits)
2020-04-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 91525d85792f..60aa34a990fa (5 commits)

Created with:
  gclient setdep -r src/third_party/skia@78debd6f6d83

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 ethannicholas@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
Bug: None
Tbr: ethannicholas@google.com
Change-Id: I44d318fb25608f8d724f54b80c89b1848c604f67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167568Reviewed-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@{#762752}

DEPS

@@ -175,7 +175,7 @@ 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': '981d590e8eba6d036b7c4f983063b6decf803fbe',
+  'skia_revision': '78debd6f6d833b8eb0896931b904b83b8bd6b737',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.