Roll src/third_party/dart 28c4c6c..1147524 (17 commits) (#17596)

https://dart.googlesource.com/sdk.git/+log/28c4c6c156e5..114752421dca

git log 28c4c6c..1147524 --date=short --first-parent --format='%ad %ae %s'
2020-04-08 [email protected] [dart:html] Remove multitest usage in some js tests
2020-04-08 [email protected] Switch migration to the isolate client.
2020-04-08 [email protected] Follow up on https://dart-review.googlesource.com/c/sdk/+/142705 to fix the assertion in the new completions in FieldDeclarations
2020-04-08 [email protected] [vm, service] Explicitly mention that timeline events are not ordered.
2020-04-08 [email protected] Migrate language_2/factory to NNBD.
2020-04-08 [email protected] Migrate language_2/field to NNBD.
2020-04-08 [email protected] [ddc] Run modular test suite in weak mode
2020-04-08 [email protected] [js_runtime] Streamline String.fromCharCodes
2020-04-08 [email protected] [dart2js] Always compute platform binaries.
2020-04-08 [email protected] Issue 41399. Check for 'dynamic' and 'Never' when verifying EXPORT_LEGACY_SYMBOL.
2020-04-08 [email protected] Make all named parameters of BestPracticesVerifier required.
2020-04-08 [email protected] Update code_metrics to support running it over a corpus
2020-04-08 [email protected] Support for analysis options in FileResolver.
2020-04-08 [email protected] Remove the special case for getGreatestLowerBound() in inference.
2020-04-08 [email protected] Don't report MISSING_DEFAULT_VALUE_FOR_PARAMETE for external factory constructors.
2020-04-08 [email protected] Revert "Reland "[vm, gc] Parallel scavenge.""
2020-04-08 [email protected] [vm/compiler] Use pc-relative calls to various stubs by moving the stubs to the isolate

Created with:
  gclient setdep -r src/third_party/dart@114752421dca

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Author: skia-flutter-autoroll

DEPS

@@ -34,7 +34,7 @@ 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': '28c4c6c156e5c6eb5d3013e9d54ee8a7037e7fa6',
+  'dart_revision': '114752421dca6e5adfe83a90bab766e89f586dce',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 0385a9d418306c4eadb3be682a5f2a37
+Signature: 3b518f8f6b62928f1028b55e86ae00bc
 
 UNUSED LICENSES: