Roll Dart SDK from 081a57c to 82b0281 (3 revisions) (#29195)

https://dart.googlesource.com/sdk.git/+log/081a57c06088..82b0281cbcf3

2021-10-14 [email protected] Version 2.15.0-220.0.dev
2021-10-14 [email protected] Version 2.15.0-219.0.dev
2021-10-14 [email protected] Version 2.15.0-218.0.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 [email protected],[email protected],[email protected] 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

Author: skia-flutter-autoroll

DEPS

@@ -39,7 +39,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '081a57c06088054bd728dd8d6e4d2f1a06790362',
+  'dart_revision': '82b0281cbcf31e977208d40b4fcd4dc71ce99b15',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -329,7 +329,7 @@ deps = {
    Var('dart_git') + '/typed_data.git@29ce5a92b03326d0b8035916ac04f528874994bd',
 
   'src/third_party/dart/third_party/pkg/usage':
-   Var('dart_git') + '/usage.git@ac53249e5230a77624f46c07c2ed965efcfc0c59',
+   Var('dart_git') + '/usage.git@e0780cd8b2f8af69a28dc52678ffe8492da27d06',
 
   'src/third_party/dart/third_party/pkg/watcher':
    Var('dart_git') + '/watcher.git' + '@' + Var('dart_watcher_rev'),

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 9a1bc34c871155f3111b636e644466a6
+Signature: 707c85c7456930a4685669f738286920
 
 UNUSED LICENSES: