Roll Skia from 3977088e23d5 to ec9b4aab874b (1 revision)

https://skia.googlesource.com/skia.git/+log/3977088e23d5..ec9b4aab874b

2020-08-07 johnstiles@google.com Enable ClangTidy check readability-const-return-type.

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/+doc/master/autoroll/README.md

Tbr: borenet@google.com
Change-Id: Iccbbc60f1dcc6748a2b17acd66b95132b1855f79
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/308688
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 cc37f17..ad85a64 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': '3977088e23d5cc0b863cea5191bd5cf73b3a466c',
+  'skia_revision': 'ec9b4aab874b602f75c0f164a5021f6c3054364d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.