Roll src/third_party/dart 617bc54..b2e300b (25 commits)

https://dart.googlesource.com/sdk.git/+log/617bc54b715d..b2e300bb7b90

git log 617bc54..b2e300b --date=short --first-parent --format='%ad %ae %s'
2020-05-08 [email protected] [vm/isolates] Fix race in ring_gc_* tests.
2020-05-08 [email protected] [vm, gc] Rename HeapPage to OldPage for symmetry.
2020-05-08 [email protected] Make createSuggestion an instance method and clean up some code in SuggestionBuilder
2020-05-08 [email protected] Move another batch of fixes to be producers
2020-05-08 [email protected] [VM/compiler] Emit a throw NoSuchMethodError for bad arity rather than aborting compilation.
2020-05-08 [email protected] [cfe] Update id-tests post unfork
2020-05-08 [email protected] [vm] Fix -Wno-conversion-null errors.
2020-05-08 [email protected] [dart:io, windwos] Try a shorter temp directory name first
2020-05-08 [email protected] [vm] Disable thread leak detection in TSAN build.
2020-05-08 [email protected] [dartdev] update help text
2020-05-08 [email protected] Split computing interface for class and mixin.
2020-05-08 [email protected] [vm] Cleanup flags which disable argument type checks and strong mode types
2020-05-08 [email protected] Add prefix start information for completions
2020-05-08 [email protected] Convert LocalConstructorContributor to use SuggestionBuilder
2020-05-08 [email protected] Migration: reorganize code in source_edit_diff_formatter.dart
2020-05-08 [email protected] [dart2js] Re-enable an inference_test.
2020-05-08 [email protected] Migration: sort declarations in instrumentation.dart.
2020-05-08 [email protected] Migration: assign better quality node targets in NodeBuilder.
2020-05-08 [email protected] [dart2js] Delete generate_code_with_compile_time_errors_test.
2020-05-08 [email protected] analyzer: Do not report non-EOL doc comments in codes.dart
2020-05-08 [email protected] [dart2js] enable null-safety also when deserializating the global data
2020-05-08 [email protected] Fix avoid_unused_constructor_parameters in analyzer.
2020-05-08 [email protected] [dart2js] add testing for prennbd sdk and cleanup nnbd enabled tests.
2020-05-08 [email protected] [Tests] Skip valid_source_locations_test for ia32 and simarm* configurations
2020-05-08 [email protected] [vm/isolates] Skip dart/isolates/ring_gc_* tests.

Created with:
  gclient setdep -r src/third_party/dart@b2e300bb7b90

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using the controls here:
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Bug: None
Tbr: [email protected]

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': '617bc54b715df9badcb8fec9031913ff5aac662e',
+  'dart_revision': 'b2e300bb7b9071b37e46ff2ef433102d7d0d6269',
 
   # 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: 57a846765a2b3f648f86b9ac99a22ed3
+Signature: 8b4f2e9ade9128bd03c73f2a5a2b9204
 
 UNUSED LICENSES: