Roll Skia from ab1310006b11 to 6438194835c4 (1 revision)

https://skia.googlesource.com/skia.git/+log/ab1310006b11..6438194835c4

2020-07-01 dragonbear@google.com Add SK_BUILD_NO_OPTS to mac base defines

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-lottie-ci-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/+doc/master/autoroll/README.md

Change-Id: If9c5abb85fc7698c95c96da11dc7a360958f5e66
Cq-Include-Trybots: skia/skia.primary:Housekeeper-PerCommit-InfraTests
Tbr: borenet@google.com
Reviewed-on: https://skia-review.googlesource.com/c/lottie-ci/+/300230
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 b6d7e16..ea6742c 100644
--- a/DEPS
+++ b/DEPS
@@ -11,7 +11,7 @@
   # 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': 'ab1310006b115a694fbc7bd9641dbda48b5fbff1',
+  'skia_revision': '6438194835c4a42813cd78690a0217f1716d35e3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.