Roll src/third_party/skia beefcb9d38c0..56015e01150e (4 commits)

https://skia.googlesource.com/skia.git/+log/beefcb9d38c0..56015e01150e

git log beefcb9d38c0..56015e01150e --date=short --first-parent --format='%ad %ae %s'
2020-03-17 fmalita@chromium.org SkStrikeCache: only validate post-purge
2020-03-17 csmartdalton@google.com Remove DynamicStateArrays from GrProgramInfo and GrPipeline
2020-03-17 csmartdalton@google.com Migrate GrFillRectOp and GrTextureOp to the new bind/draw API
2020-03-17 kjlubick@google.com Add fiddle demonstrating alpha when used on saveLayer

Created with:
  gclient setdep -r src/third_party/skia@56015e01150e

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 egdaniel@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: egdaniel@google.com
Change-Id: I36f6124e0e56fe3f34c25b10f0dd34bd20871ae3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107788Reviewed-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@{#751152}

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': 'beefcb9d38c002dc023bbe1a69b3d56ac9b58479',
+  'skia_revision': '56015e01150eaab826a8ef2526a34cfe67868b6a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.