Roll skia c971747eefa0..a7bb87ed532d (1 commits)

https://skia.googlesource.com/skia.git/+log/c971747eefa0..a7bb87ed532d

git log c971747eefa0..a7bb87ed532d --date=short --first-parent --format='%ad %ae %s'
2019-12-03 mtklein@google.com replace CSXformSteps::Required() in SkShader

Created with:
  gclient setdep -r skia@a7bb87ed532d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-skiabot-test-autoroll
Please CC borenet@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

Bug: None
Tbr: borenet@google.com
Change-Id: Iab8678ebd08d134e2571c37c2fb06f66da05166e
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/257711
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 2b2f8f9..6766deb 100644
--- a/DEPS
+++ b/DEPS
@@ -3,7 +3,7 @@
   # 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': 'c971747eefa050fa2d8ff3de6247c51b1f1f6cb9',
+  'skia_revision': 'a7bb87ed532df9db52bc12341e9f33b6ad563fdb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.