Roll skia b9f4881193b2..4af42fcca187 (1 commits)

https://skia.googlesource.com/skia.git/+log/b9f4881193b2..4af42fcca187

git log b9f4881193b2..4af42fcca187 --date=short --no-merges --format='%ad %ae %s'
2019-09-16 brianosman@google.com Fix precompiling shaders on GLES / Android

Created with:
  gclient setdep -r skia@4af42fcca187

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: Idccf0d2d983cb705f6a11aefcca5b43caba9d1f3
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/241856
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 3e78dfc..ec20d9a 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': 'b9f4881193b2950eee2808da3bdef1f38e78c116',
+  'skia_revision': '4af42fcca187398b81b7266d78db748827c2e621',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.