and roll Dart to 52783837369de45d3372cb6c6b7cdd63e71cd829.

https://dart.googlesource.com/sdk.git/+log/fed66f60a3bc..25ef5dc559cf

2020-10-30 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-4.0.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 dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

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/master/autoroll/README.md

* Manual Roll of Dart from ba80ed989c...9c6e76468c

dart-lang/sdk@ba80ed989cc Version 2.11.0-277.0.dev
dart-lang/sdk@619e388a1d8 Breaking changes for analyzer version 0.41.
dart-lang/sdk@e46c31c24c5 Version 2.11.0-276.0.dev
dart-lang/sdk@13704520a0c [cfe] Indicate nullability as assignability issue when appropriate
dart-lang/sdk@33b7f1425e0 Migration: remove unreachable `break` statements
dart-lang/sdk@68fe2649f38 Migration: remove 2 pixel offset from CSS for `.region.informative-region`.
dart-lang/sdk@f506071e34f Add DartType.alias{Element,Arguments} and class TypeAliasElement
dart-lang/sdk@5b2f57d3655 Fix changelog
dart-lang/sdk@d459f2244a5 Enable non-function type alias tests for CFE based tools
dart-lang/sdk@5ac5b710ee8 Migration --apply-changes implies --no-web-preview
dart-lang/sdk@8abf6c67adc Add test of potentially constant scopes.
dart-lang/sdk@146423c02d7 Version 2.11.0-275.0.dev
dart-lang/sdk@d38b366eb66 Add quick fix to remove unnecessary null-aware assignments
dart-lang/sdk@1a56b8e7ebc Version 2.11.0-274.0.dev
dart-lang/sdk@d5118d5fc83 Reland "[ Service / dart:isolate ] Added getPorts RPC and 'debugName' optional"
dart-lang/sdk@2672eb34f65 Add Flutter plugins to the list of allowed null safety experiments
dart-lang/sdk@30d13109e71 Error on all ignored command line arguments with a named config.
dart-lang/sdk@a983155d44e [vm/ffi] Remove bytecode mode only runtime entries
dart-lang/sdk@5f5c0ec0256 Version 2.11.0-273.0.dev
dart-lang/sdk@3c5d1d25755 fix nodes for path error reporting
dart-lang/sdk@0128ffa6d1b Add most of the remaining parser diagnostics to the data file parser
dart-lang/sdk@91be377fdaa [io/ssl] Avoid redundant handshake call that can break ongoing handshake try-retry sequence.
dart-lang/sdk@774e18d14ad Issue 43925. Set the enclosing class for completion.
dart-lang/sdk@061848e97e0 Cleanup misc remaining references to bytecode
dart-lang/sdk@bc01cb740ad [vm] Don't assume fields are already canonical when canonicalizing closures.
dart-lang/sdk@2fd4b4f5628 [dart2js, ddc] Emit native null checks in sound mode only
dart-lang/sdk@8b68bb4191c Revert "Revert "[ddc] Move native null-checks to definitions""
dart-lang/sdk@d4c03fbc1b2 [ddc] Add more descriptive error for native null assertions
dart-lang/sdk@312a572ade0 [vm/ffi] Fix prepare_flutter_bundle.dart
dart-lang/sdk@31c065ef4ce Change frontend server expression evaluation tests to use strong ddc platform sdk
dart-lang/sdk@2fafb4061fe Remove LibrariesLog, we don't use it anymore.
dart-lang/sdk@2653b851d33 Version 2.11.0-272.0.dev
dart-lang/sdk@e5dfd384041 check for invalid git and path deps in publishable packages
dart-lang/sdk@f8fdb4be05e Remove return type from addSource().
dart-lang/sdk@7588ed86dee Remove bytecode mode from the VM
dart-lang/sdk@c877d5bf3ec [pkg/vm_service] remove three deprecation warnings
dart-lang/sdk@2eef1aa1ad5 Prepare analyzer_cli/ tests for turning Null Safety on by default.
dart-lang/sdk@80f0976e02b [pkg/nnbd_migration] mark package:nnbd_migration as not publishable
dart-lang/sdk@1958d61b022 Issue 43929. Report HintCode.DEPRECATED_MEMBER_USE for Null Safe from Legacy, refactoring.
dart-lang/sdk@68c50f7f92d Migration: re-work test_informationalRegion_containsTraceLinks_separateDrive.
dart-lang/sdk@ee740fae4aa [dart2js] Inference of List.generate elements
dart-lang/sdk@c3ddc5c374f [vm/concurrency] Add EventLoopLatencyJson350KB bechmark
dart-lang/sdk@5851f8bc0c3 [Analyzer] Add a fix for unnecessary_non_null_assertion
dart-lang/sdk@e38d42fc7dc [android] Switch to Flutter Android tooling
dart-lang/sdk@ed009afc4cb [package:js] Add static errors for invalid extends
dart-lang/sdk@2e99e593699 Fix integration tests for analyzer/ and analysis_server/ in preparation for Null Safety turned on.
dart-lang/sdk@91815705131 Migration: Work around null reference exception with complex type parameters.
dart-lang/sdk@a777d2b7984 Sort declarations in api_test.dart
dart-lang/sdk@a99904a45a7 [vm/nnbd] Explicitly opt-out test helper scripts from null safety to prepare for NNBD turned on
dart-lang/sdk@77a0daeda9d Update to latest package:collection
dart-lang/sdk@f78c40e32a5 Revert "Reland "[ Service / dart:isolate ] Added getPorts RPC and 'debugName' optional""
dart-lang/sdk@5a3e7bf18fe [Dart CLI] Refactor analytics
dart-lang/sdk@7a87580ec49 [vm] Avoid racy access to SafepointRwLock::reader_ids_
dart-lang/sdk@e5184d71b76 Version 2.11.0-271.0.dev
dart-lang/sdk@7d764a6b3ab Get the observatory tests correctly opting out of sound null safety.
dart-lang/sdk@38e34147481 analyzer_plugin: Prepare tests for Null safety flag flip.
dart-lang/sdk@e9bf10bda0c Version 2.11.0-270.0.dev
dart-lang/sdk@56947222cca Fixes for analysis_server/ tests for Windows.
dart-lang/sdk@7a60fd3fd25 Fix Glob creation, PubspecValidator dependencyPath.
dart-lang/sdk@a5d45118476 Reland "[ Service / dart:isolate ] Added getPorts RPC and 'debugName' optional"
dart-lang/sdk@6360dcbecbe Version 2.11.0-269.0.dev
dart-lang/sdk@14e4d5fb480 [Tests] - Explicitly opt out vm/dart_2/splay_test.dart
dart-lang/sdk@20b8b1c0cf2 [vm/concurrency] Introduce a read lock acquisition of program_lock.
dart-lang/sdk@76118806bdc [dart:io / Service] Rename State class to _State to avoid class name conflicts with Flutter
dart-lang/sdk@e2cc75e847a Fix the offset used when reporting errors inside of string literals
dart-lang/sdk@29c7474845d Add a test for accessing type arguments
dart-lang/sdk@297fb8606a7 Un-hide the dart migrate command from stable.
dart-lang/sdk@dac61ff8794 Remove a message for pre-nnbd sdks.
dart-lang/sdk@05af48a5dfa Version 2.11.0-268.0.dev
dart-lang/sdk@a074c793b84 Rename to resolveTestCode() and resolveTestFile().
dart-lang/sdk@47a2ab28666 Prepare to publish analyzer 0.40.5 and _fe_analyzer_shared 12.0.0.
dart-lang/sdk@af8413d8e92 [vm/concurrency] Add write lock acquisiton when updating Class direct_subclasses.
dart-lang/sdk@4f630a9a162 [typed_data] Remove specific Errors from docs
dart-lang/sdk@d9d7324b272 Issue 43777. Update analysis_server/ tests to run when Null Safety is enabled by default in 2.12
dart-lang/sdk@3e856b8ace6 [vm/concurrency] Allow concurrent access to invocation dispatcher cache
dart-lang/sdk@e8ff7f9d294 Version 2.11.0-267.0.dev
dart-lang/sdk@c45d52b62aa Rework the parser to parse code fragments rather than value generators
dart-lang/sdk@34cedb980c9 [kernel] Make Procedure.kind final
dart-lang/sdk@50d36afc34e [release] Add release notes for 2.10.3
dart-lang/sdk@2928af2b123 [kernel] Remove unused Class.level, ClassLevel enum and shift Library.flags down
dart-lang/sdk@ff60518cada [kernel] Remove getChildFromMember from CanonicalName
dart-lang/sdk@741bb5ec4ee [kernel] Change library nnbd bit encoding slightly
dart-lang/sdk@ae5fc78992a [kernel] Remove 'addMember'

* Adjust comment.

This includes the commits from

  https://dart.googlesource.com/sdk.git/+log/6e015bd9cddb..9c6e76468ca4

as well as the changes from

  https://github.com/flutter/engine/pull/22149/files

which are needed due to dart-lang/sdk@23ee425de7533b

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

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/master/autoroll/README.md

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

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/master/autoroll/README.md

https://skia.googlesource.com/skia.git/+log/7737a5bd2510..5567a6091ceb

2020-10-27 brianosman@google.com Guard traversal of certain kinds of mid-optimization IfStatement
2020-10-27 johnstiles@google.com Pass function arguments using SkSpan instead of count + ptr.
2020-10-27 egdaniel@google.com Add uma histogram tracking for the number of submit render passes.
2020-10-27 johnstiles@google.com Prototype helper functions from FP files before use.
2020-10-27 johnstiles@google.com Mangle function names as a separate step before emitting func-bodies.
2020-10-27 mtklein@google.com remove absl experiment
2020-10-27 mtklein@google.com use ieee divide
2020-10-27 ethannicholas@google.com Made IRNode smaller

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

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/master/autoroll/README.md

This partially fixes flutter/engine + dart-lang/sdk head-head build and will allow auto roller to work again.