Roll src/third_party/dart df5036eb6e73..8e5354dccb64 (14 commits)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/df5036eb6e73..8e5354dccb64

git log df5036e..8e5354d --date=short --first-parent --format='%ad %ae %s'
2020-03-04 jakemac@google.com update shelf_packages_handler to the latest version
2020-03-04 srujzs@google.com Remove html_individual_config from worker_test
2020-03-04 srujzs@google.com Separate out lib_2/html/history_test
2020-03-04 regis@google.com [VM/nnbd] Check consistency of non-nullable compiled mode of loaded libraries.
2020-03-04 alexmarkov@google.com [nnbd/corelib] Fix performance regressions due to casts in 'get current' in iterators
2020-03-04 liama@google.com [vm] Handle required params in closures and tear-offs
2020-03-04 pquitslund@google.com corpus support
2020-03-04 markzipan@google.com [dartdevc] Using hasOwnProperty instead of getOwnPropertyDescriptor.value.
2020-03-04 fishythefish@google.com [dart2js] Add flag to enable printing '*' on legacy types.
2020-03-04 jakemac@google.com delete packageRoot support in test runner package, migrate to package_config from package_resolver
2020-03-04 scheglov@google.com Allow adding attachments to CrashReportSender.sendReport()
2020-03-04 scheglov@google.com Fix crash in declaredParameterElement().
2020-03-04 bkonyi@google.com [ package:vm_service ] Update Dart code generator to use collection control flows
2020-03-04 jakemac@google.com Use package_config instead of package_resolver in frontend_server

Created with:
gclient setdep -r src/third_party/dart@8e5354dccb64

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