* Add tristate to parent checkbox for DataTable to follow Material specifications

* Add decoration parameter to DataTable and DataTableTheme

Revert "Flutter Driver - Create widget finders from serialized finders extensions (#67456)" (#67687)

This reverts commit 74f6fa45.

This converts the packages/flutter/test/services directory to NNBD, now that the services package is converted.

I changed the signature of checkMessageHandler and checkMockMessageHandler on BinaryMessenger to take a nullable handler, since the tests wanted to check to make sure a handler wasn't set, and that functionality no longer works if the handler is non-nullable.

* [flutter_tools] enable LocalDevFSWriter for desktop devices, iOS simulator

* Update device.dart

* Update desktop_device_test.dart

* fix analysis errors

We used to use zip to verify the integrity of downloaded zip archives, but we now use unzip. This removes the .zip method from OperatingSystemUtils.

Remove global variables from compile.dart and devices.dart (except for dds which needs more changes).

#47161

Fixes https://github.com/flutter/flutter/issues/67343

* adds titleSpacing in AppBarTheme
Co-authored-by: Shi-Hao Hong <shihaohong@google.com>

Reland "Add CompositedTransformFollower.{followerAnchor, leaderAnchor} for custom anchoring (#64930)" (#65871) (#65884)

Just converting some test files to NNBD

* enable null_check_on_nullable_type_parameter and tighten_type_of_initializing_formals

* fix CI

Work around the glibc bug that causes rare Chrome crashes