Roll src/third_party/dart ba8baa46b452..82f8a5451fae (40 commits)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/ba8baa46b452..82f8a5451fae

git log ba8baa4..82f8a54 --date=short --first-parent --format='%ad %ae %s'
2020-03-21 rnystrom@google.com Add "ffi_2" to the CFE's opt out test directory list.
2020-03-21 kevmoo@google.com Revert "Remove unittest from DEPS, .packages, package_config.json"
2020-03-21 bkonyi@google.com Revert "Reland "[ VM / Service ] Migrated Observatory service tests from package:unittest to package:test and package:expect.""
2020-03-21 bkonyi@google.com Revert "[ Service ] Bump package:test timeout to 10 minutes for VM service tests"
2020-03-21 rmacnak@google.com [vm] Increase precision of MSAN unpoisoning during deopt.
2020-03-20 paulberry@google.com Migration: mark for-each loop variables as initialized
2020-03-20 paulberry@google.com Migration: use prefixes when introducing "as" expressions
2020-03-20 bkonyi@google.com [ Service ] Bump package:test timeout to 10 minutes for VM service tests
2020-03-20 kevmoo@google.com Remove unittest from DEPS, .packages, package_config.json
2020-03-20 srawlins@google.com Migrator: Improve scrolling behavior for elements near top or bottom
2020-03-20 jcollins@google.com Update the README based on meeting notes
2020-03-20 nshahan@google.com [tests] Add language version comment ddc tests
2020-03-20 sra@google.com [dart2js] Handle NullableType from createFromStaticType
2020-03-20 sra@google.com null-safety fixes for ListCopy benchmark setup
2020-03-20 nbosch@google.com Allow null arguments to tearoffInterop
2020-03-20 kevmoo@google.com NNDB: dart:collection Fix ListMixin operator+
2020-03-20 paulberry@google.com Migration: handle field overrides
2020-03-20 bkonyi@google.com Reland "[ VM / Service ] Migrated Observatory service tests from package:unittest to package:test and package:expect."
2020-03-20 jcollins@google.com Prepare analysis_server_client for isolate implementation.
2020-03-20 jsimmons@google.com [vm] Disable integer division on Android ARM emulators
2020-03-20 nbosch@google.com Fix static errors in nnbd_js_interop_test
2020-03-20 srawlins@google.com Migrator: fix test to assert on information region when not making a parameter nullable
2020-03-20 devoncarew@google.com [nnbd migration] initial mogration workflow docs
2020-03-20 rileyporter@google.com Convert from _JsonMap to Map<String, Object> in corelib/map_entry_test
2020-03-20 jwren@google.com Add missing null checks for return values from AstNode.findPrevious(..)
2020-03-20 alexmarkov@google.com [vm/nnbd] Run kernel-service and vm-service isolates in NNBD weak mode
2020-03-20 rnystrom@google.com Unittest is finally going the way of the dinosaurs.
2020-03-20 jwren@google.com Add some additional tests to test the commands that are currently passing the help == --help assertion.
2020-03-20 eernst@google.com Adjust tests where a TypeError may occur to also expect ArgumentError
2020-03-20 sortie@google.com [nnbd] Fix remaining analyzer issues in dart:io and dart:_http.
2020-03-20 pquitslund@google.com quickfix for prefer_const_constructors_in_immutables
2020-03-20 johnniwinther@google.com [cfe] Don't include Function in Class.supertype and Class.implementedTypes
2020-03-20 scheglov@google.com Issue 41095. Update flatten() to null safety.
2020-03-20 sigmund@google.com [dart2js] fix in normalization
2020-03-20 rmacnak@google.com [mirrors] Explicitly use the new signature of Object.==.
2020-03-20 joshualitt@google.com [dart2js] Fix storing non-JsObject in property.
2020-03-20 johnniwinther@google.com [WATCHLISTS] Remove johnniwinther@ from dart2js watchlist
2020-03-20 kustermann@google.com [vm/compiler] Compiler::CompileFunction can no longer fallback to Precompiler::CompileFunction
2020-03-20 sstrickl@google.com [vm/aot] Add VM entry point annotation to _CompactLinkedHashSet.
2020-03-20 jonasfj@google.com Bump DEPS for pub to include pub outdated

Created with:
gclient setdep -r src/third_party/dart@82f8a5451fae

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
Tbr: dart-vm-team@google.com