Roll src/third_party/skia d1988219065a..6cb8168c2b9b (3 commits)

https://skia.googlesource.com/skia.git/+log/d1988219065a..6cb8168c2b9b

git log d1988219065a..6cb8168c2b9b --date=short --first-parent --format='%ad %ae %s'
2020-03-24 bsalomon@google.com Reland "Revert "Drawing YUVA images does not flatten for bicubic.""
2020-03-23 fmalita@chromium.org [sksg] Remove redundant BUILD.gn deps
2020-03-23 bsalomon@google.com Revert "Revert "Drawing YUVA images does not flatten for bicubic.""

Created with:
  gclient setdep -r src/third_party/skia@6cb8168c2b9b

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: I2c818330625b08bd1a02c5411a3ed79ee2ce22e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2117249Reviewed-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@{#752740}

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': 'd1988219065ad7cf6e56f8c72682372ff41fe3ba',
+  'skia_revision': '6cb8168c2b9b757110883a6974e45c7f76db228c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.