Roll Dart SDK from 660765538200 to a3d3777094ce (18 revisions)

[skia-flutter-autoroll]

https://dart.googlesource.com/sdk.git/+log/660765538200..a3d3777094ce

2020-07-16 [email protected] Migration: add a hook invoked after changes are applied.
2020-07-16 [email protected] [web] remove mirrors patch for web compilers.
2020-07-15 [email protected] [dart2js] Refractored ConstantValueTypeMasks
2020-07-15 [email protected] Modify parser to handle abstract fields.
2020-07-15 [email protected] bulk fixes impl
2020-07-15 [email protected] [dart2js] Port ~20 tests to nnbd #3.
2020-07-15 [email protected] [ package:dds ] Add missing package:shelf_static dependency in pubspec.yaml
2020-07-15 [email protected] Revert "Move BytesBuilder class and implementation to dart:typed_data."
2020-07-15 [email protected] [ package:dds ] Add server-sent event (SSE) support to DDS
2020-07-15 [email protected] Improve diagnostic message when short circuiting (issue 42599)
2020-07-15 [email protected] [ Service ] Fix line numbers in step_through_mixin_from_sdk_test
2020-07-15 [email protected] [ package:dds ] Fix issue where StateError could be thrown if DDS shuts down with in-flight requests
2020-07-15 [email protected] [vm/nnbd] Do not check if NNBD experimental flag is enabled for non-null assertions
2020-07-15 [email protected] Issue 42699. Stop reporting EXPORT_DUPLICATED_LIBRARY_NAMED and IMPORT_DUPLICATED_LIBRARY_NAMED.
2020-07-15 [email protected] [vm] Fix --use-bare-instructions=false on simarm_x64.
2020-07-15 [email protected] [vm] Add tests and packages to the Fuchsia package
2020-07-15 [email protected] Make CiderCacheEntry public.
2020-07-15 [email protected] [infra] Update Chrome used in testing to version 84

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 [email protected] 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

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[skia-flutter-autoroll]

Commit queue failed; closing this roll.