Roll Dart SDK from 1e098b6e5ef0 to f4a696c76682 (2 revisions) (#30922)

https://dart.googlesource.com/sdk.git/+log/1e098b6e5ef0..f4a696c76682

2022-01-19 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.17.0-30.0.dev
2022-01-19 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.17.0-29.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC aaclarke@google.com,dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

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/main/autoroll/README.md
https://dart.googlesource.com/external/github.com/flutter/engine/+/d84959a366aa2c9df3693e954ae7f5463f4de51a
diff --git a/commits.json b/commits.json
index 35f1f19..4814e60 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"2ebc3d3e442d5b70d5755fdfa19787af8d2c645b",
+  "external/github.com/flutter/engine":"d84959a366aa2c9df3693e954ae7f5463f4de51a",
   "external/github.com/flutter/flutter":"8017883a5dfd13d709c4bd04d617f54a6cb2271f",
   "sdk":"a03eb19a61dc9a60bb82bf5b23490e7bdab934a3"
 }
\ No newline at end of file