Roll src/third_party/skia 988ce0490a11..5c4c61eeb38f (3 commits)

https://skia.googlesource.com/skia.git/+log/988ce0490a11..5c4c61eeb38f

git log 988ce0490a11..5c4c61eeb38f --date=short --first-parent --format='%ad %ae %s'
2020-03-25 bsalomon@google.com Reland x4 "Drawing YUVA images does not flatten for bicubic."
2020-03-25 csmartdalton@google.com ccpr: Polyfill buffer mapping when not supported
2020-03-25 mtklein@google.com update to clang 10

Created with:
  gclient setdep -r src/third_party/skia@5c4c61eeb38f

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 robertphillips@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: robertphillips@google.com
Change-Id: I6e2a4b09b30600824dc561ab9276f12a79c4d6f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121213Reviewed-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@{#753386}

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': '988ce0490a11498dc18afc6923afe4b4ce8c2e72',
+  'skia_revision': '5c4c61eeb38fbad721e42ec68f486514a2450418',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.