Roll Dart SDK from 7706afbcf5c6 to 3a764b7ae4d9 (33 revisions)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/7706afbcf5c6..3a764b7ae4d9

2020-05-19 brianwilkerson@google.com Stop suggesting private static members in libraries where they are not visible
2020-05-19 scheglov@google.com Handle the case when source cannot be found for uri
2020-05-19 brianwilkerson@google.com Attempt to shorten the output from completion_metrics
2020-05-19 zichangguo@google.com [dart:io] Support abstract unix domain socket on Linux
2020-05-19 mfairhurst@google.com [nnbd_migration] Fix navigation tree on windows.
2020-05-19 mfairhurst@google.com [nnbd_migration] Fix stack trace links on windows.
2020-05-19 mfairhurst@google.com [nnbd_migration] Fix edit region top link on windows.
2020-05-19 nshahan@google.com [ddc] Delete dartdevc_test_kernel_local target
2020-05-19 brianwilkerson@google.com More improvements to computing context type
2020-05-19 srujzs@google.com [dart:html] Use JS name for promise call
2020-05-19 zichangguo@google.com [dart:io] Fixes _HttpHeaders forcing lowercased Header fields.
2020-05-19 mfairhurst@google.com Revert "[nnbd_migration] Fix two popup style bugs"
2020-05-19 regis@google.com [VM/nnbd] The equivalent of dynamic as bound is Object? and not Object.
2020-05-19 paulberry@google.com Migration: remove _nnbdIsEnabled flag from migration unit test.
2020-05-19 paulberry@google.com Migration: remove abstract interfaces defined by analysis_server for use by nnbd_migration.
2020-05-19 paulberry@google.com Migration: copy pages.dart to nnbd_migration package.
2020-05-19 paulberry@google.com Migration: remove dependency on analysis server's fix_code_task.dart.
2020-05-19 paulberry@google.com Migration: eliminate preview_site_test.dart's dependency on analysis_server.
2020-05-19 mfairhurst@google.com [nnbd_migration] Fix two popup style bugs
2020-05-19 rmacnak@google.com [vm, gc] Account for AllocateArray or CloneContext returning objects that have already been added to the remembered set.
2020-05-19 rmacnak@google.com [vm] Fix overly broad HeapIterationScope in getInstances.
2020-05-19 srawlins@google.com Migrator: Add decorated types for class alias implicit constructor parameters
2020-05-19 paulberry@google.com Migration: replace imports of analysis_server with imports of analyzer_plugin where possible.
2020-05-19 paulberry@google.com Migration: remove isolate_server.dart.
2020-05-19 paulberry@google.com Migration: remove analysis_server dependencies from some test classes.
2020-05-19 paulberry@google.com Sort declarations in nnbd_migration_test_base.dart
2020-05-19 paulberry@google.com Migration: extract some implementation details from migration_cli.dart
2020-05-19 mfairhurst@google.com [nnbd_migration] Support change hint type in stack trace
2020-05-19 mfairhurst@google.com [nnbd_migration] Support remove hint action in stack traces
2020-05-19 mfairhurst@google.com [nnbd_migration] Support deletions in UnitInfo.handleInsertion
2020-05-19 mfairhurst@google.com [nnbd_migration] Support replace/delete in offset mappers.
2020-05-19 brianwilkerson@google.com Convert more fixes to use producers
2020-05-19 dmitryas@google.com [cfe] Treat types containing InvalidType as invalid in assignability

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