Roll Dart SDK from 9fcac032b669 to 52dd48651be4 (17 revisions)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/9fcac032b669..52dd48651be4

2020-06-21 [email protected] Convert the remaining quick assists to use CorrectionProducer
2020-06-20 [email protected] Enable v1.9 pedantic lints...
2020-06-20 [email protected] Revert "Reland : [VM/Runtime] Cleanup package config initialization code"
2020-06-20 [email protected] [cfe] Mark late setters as isGenericCovariantImpl
2020-06-20 [email protected] Add --track-widget-creation to kernel_front_end.dart
2020-06-20 [email protected] [benchmark] BigIntParsePrint: Hoist value in all loops
2020-06-20 [email protected] Reland : [VM/Runtime] Cleanup package config initialization code
2020-06-20 [email protected] [dart2js] final locals may be assigned
2020-06-20 [email protected] [VM/Runtime] - Fix for issue dart-lang/sdk#42421
2020-06-20 [email protected] Added module information to metadata and use by frontend_sever
2020-06-19 [email protected] [ddc] Normalize T to Never when T extends Never
2020-06-19 [email protected] [dart:io] HttpClientConnection is destroyed for "CONNECT" request
2020-06-19 [email protected] [dart2js] Add support for Never as a type literal.
2020-06-19 [email protected] [dart2js] Visit type parameter bounds in the scope visitor.
2020-06-19 [email protected] Migrate language_2/type_promotion to NNBD.
2020-06-19 [email protected] Add CiderCompletionComputer.warmUp()
2020-06-19 [email protected] Fix duration.toString() to conform the description

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https://autoroll.skia.org/r/dart-sdk-flutter-engine
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[fluttergithubbot]

This pull request is not suitable for automatic merging in its current state.

• The status or check suite build_and_test_linux_unopt_debug has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_tests-1-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.
• The status or check suite web_tests-2-linux has failed. Please fix the issues identified (or deflake) before re-applying this label.

[skia-flutter-autoroll]

Commit queue failed; closing this roll.