Roll src/third_party/dart 95e11bc2d30f..2fd798ed5c79 (28 commits)

[skia-flutter-autoroll]

Roll src/third_party/dart 95e11bc..2fd798e (28 commits)

https://dart.googlesource.com/sdk.git/+log/95e11bc2d30f..2fd798ed5c79

git log 95e11bc..2fd798e --date=short --first-parent --format='%ad %ae %s'
2020-05-15 whesse@google.com Change flutter builder to build flutter libraries in weak mode
2020-05-15 fishythefish@google.com [dart2js] Fix weak-mode constant folding of null is Object.
2020-05-15 fishythefish@google.com [dart2js] Change --(no-)null-safety to --(no-)sound-null-safety.
2020-05-15 aam@google.com [vm] Fix instance hash calculation to accommodate unboxed fields during cross compilation.
2020-05-15 rmacnak@google.com [vm, gc] Allow for more parallelism in old-space GCs.
2020-05-15 fishythefish@google.com [dart2js] Add --nnbd-strong SDK.
2020-05-14 joshualitt@google.com [dart2js] Fix mixin_typevariable_test for nnbd.
2020-05-14 mfairhurst@google.com [nnbd_migration] Handle stack trace edit links in web view
2020-05-14 mfairhurst@google.com [nnbd_migration] Handle new stack trace add hint action
2020-05-14 joshualitt@google.com [dart2js] Port function_type_variable_test to nnbd.
2020-05-14 alexmarkov@google.com Reland "[vm/nnbd] Auto-detect null-safety from entry point in kernel compilers"
2020-05-14 scheglov@google.com Annotate two failing inference tests with the corresponding issue.
2020-05-14 nshahan@google.com [ddc] Restore self hosted training for snapshot
2020-05-14 paulberry@google.com Migration: remove dead code
2020-05-14 alexmarkov@google.com [vm/nnbd] Auto-detect null safety mode when bootstrapping from kernel
2020-05-14 bkonyi@google.com [ VM / DartDev ] Fix issue where --disable-dart-dev and --observe argument order mattered
2020-05-14 scheglov@google.com Remove SetLiterals specific subtypes of tests.
2020-05-14 rnystrom@google.com Migrate language_2/getter to NNBD.
2020-05-14 scheglov@google.com Remove deprecated 'typeSystem' parameter from InheritanceManager3.
2020-05-14 scheglov@google.com Remove deprecated 'enableSuperMixins' from ErrorVerifier.
2020-05-14 jwren@google.com Update telemetry.dart with the most recent environment variables from the flutter tooling. Also: a TODO has been added to check for Azure bot usage.
2020-05-14 johnniwinther@google.com [cfe] Initial support for external fields.
2020-05-14 johnniwinther@google.com [cfe] Handle covariant late fields in lowering
2020-05-14 rmacnak@google.com [vm] Further fix asymmetry in Load/StoreNonPointer.
2020-05-14 johnniwinther@google.com [cfe] Change implicit catch type to Object
2020-05-14 paulberry@google.com Migration: connect dartdev to new command-line API.
2020-05-14 paulberry@google.com Migration: do not parse args in new CLI handler.
2020-05-14 srawlins@google.com Migrator: Improve adding explicit types to parameters and variable declarations

Created with:
gclient setdep -r src/third_party/dart@2fd798ed5c79

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/+/master/autoroll/README.md

Bug: None
...