* Fixed codesign error message width

* Fixed mac_test

* Removed snackbar code

All slivers must start with Sliver (or CupertinoSliver).
All widgets must have a key argument.

Also, some minor tweaks here and there to style and docs.

Revert "Roll engine to fed2ea458ed49088d33eddabc546ba56d600c717 (includes dart roll) (#19044)" (#19276)

This reverts commit f4a038da as it breaks microbenchmark tests.

* Roll engine to rolled dart
Add connectionTimeout property to class that extends HttpOverrides.
Upgrade packages.
Add more type fixes.
Update goldens hash.
Add more type fixes.
Upgrade packages.
Fix tests.
Remove strong-mode from analysis options yaml file.
Increase dev/devicelab timeout from 2 to 10 seconds.
Added getVM to waitForViews. Fix type errors in compileExpression.

* Pick up engine revision with fix for microbenchmarks regression.
Increase default timeout from 20/30 to 60s.

Instead, if the surface is 0x0 semantics will just generate one root semantics node with size of 0x0. The node will have no children because all children are invisible and (except for the root node with this change) invisible children are dropped.

Some things require a port (eg. `flutter attach`) and will forward it on to the device, so we shouldn't force clients to parse it out of a uri.

This adds a call to 'pub get' if the pubspec.yaml is out of date wrt the .packages file when a hot reload is requested.

Fixes #15879

…30)"

Causes microbenchmarks to start failing. This included the following
engine PR, which appears to be the culprit:
* Remove vmservice_io.main from entry points. (flutter/engine#5625)

This reverts commit 36437904.

They should fail, because we don't have real support yet.

Also, make the debug override work in release builds, so that people
on those platforms have a workaround.

Includes:
* Remove vmservice_io.main from entry points. (flutter/engine#5625)
* Roll src/third_party/skia 7e2327b133db..723b1f6ef941 (1 commits) (flutter/engine#5642)
* Roll src/third_party/skia 24d18ced1ad7..7e2327b133db (6 commits) (flutter/engine#5641)
* Roll src/third_party/skia a1e5630183c1..24d18ced1ad7 (7 commits) (flutter/engine#5639)

This should fix #18952 and #813

* ensure a11y state is communicated back to flutter (flutter/engine#5631)
* Roll src/third_party/skia b1b87d9df81e..a1e5630183c1 (10 commits) (flutter/engine#5637)
* Roll src/third_party/skia 385804514edf..b1b87d9df81e (6 commits) (flutter/engine#5636)
* Roll src/third_party/skia e97bb26893a1..385804514edf (1 commits) (flutter/engine#5635)
* Roll src/third_party/skia e2e52e46ca63..e97bb26893a1 (1 commits) (flutter/engine#5634)
* Roll src/third_party/skia 14de25dfc7c4..e2e52e46ca63 (2 commits) (flutter/engine#5633)
* Roll src/third_party/skia 551dc3e91143..14de25dfc7c4 (2 commits) (flutter/engine#5630)
* libtxt: apply an offset to drawing operations instead of translating the canvas (flutter/engine#5628)
* Roll src/third_party/skia 059a9ab4bcd0..551dc3e91143 (5 commits) (flutter/engine#5629)
* Roll src/third_party/skia 45c9dab4c3ec..059a9ab4bcd0 (8 commits) (flutter/engine#5627)
* Remove some unused code from the Android host (flutter/engine#5619)
* Roll src/third_party/skia 37b7e4714558..45c9dab4c3ec (1 commits) (flutter/engine#5626)
* Roll src/third_party/skia c421ca1d6e41..37b7e4714558 (2 commits) (flutter/engine#5624)
* Roll src/third_party/skia 5b201e3b0ba8..c421ca1d6e41 (3 commits) (flutter/engine#5623)
* Roll src/third_party/skia d47fe095cf88..5b201e3b0ba8 (6 commits) (flutter/engine#5622)
* Roll src/third_party/skia 9c0ce41cf711..d47fe095cf88 (12 commits) (flutter/engine#5618
* Roll src/third_party/skia d4b2adeaa929..9c0ce41cf711 (7 commits) (flutter/engine#5617)
* Roll src/third_party/skia f46710802ad5..d4b2adeaa929 (1 commits) (flutter/engine#5616)

This appears to trigger an error during AOT snapshot of the gallery as
follows:

```
stdout: [   +6 ms] Building AOT snapshot in release mode (ios-release)...
stdout: [  +15 ms] Extra gen_snapshot options: [--print_snapshot_sizes]
stdout: [   +7 ms] /usr/bin/arch -x86_64 /Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/gen_snapshot --await_is_keyword --causal_async_stacks --packages=.packages --url_mapping=dart:ui,/Users/flutter/.cocoon/flutter/bin/cache/pkg/sky_engine/lib/ui/ui.dart --url_mapping=dart:vmservice_io,/Users/flutter/.cocoon/flutter/bin/cache/pkg/sky_engine/sdk_ext/vmservice_io.dart --embedder_entry_points_manifest=/Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/dart_vm_entry_points.txt --embedder_entry_points_manifest=/Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/dart_io_entries.txt --print_snapshot_sizes --snapshot_kind=app-aot-assembly --assembly=build/aot/arm64/snapshot_assembly.S /Users/flutter/.cocoon/flutter/examples/flutter_gallery/lib/main.dart
stderr: [+9324 ms] Error: 'file:///Users/flutter/.cocoon/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_segmented_control_demo.dart': error: line 19 pos 1: circular dependency for function _CupertinoSegmentedControlDemoState
stderr: [        ] class _CupertinoSegmentedControlDemoState extends State {
stderr: [        ] ^
stderr: [  +33 ms] Dart snapshot generator failed with exit code 254
stderr: [        ] Snapshotting (IOSArch.arm64) exited with non-zero exit code: 254
stdout: [        ] Built to build/aot/.
stdout: [  +10 ms] "flutter aot" took 9,485ms.
```

This reverts commit 9d49ee3b.

* Adding segmented control to gallery

* Fix use of Future<void> as a Future<bool>

This should make it more obvious from the error what's gone wrong if we see a repeat of #19096 (previously the error was something like "Bad state: future already completed").

* Rename util -> test_utils

* Rename flutter_test_driver -> test_driver

* Switch testWithContext -> test

* Remove unused import

* Move test project into a class to make it easier to have multiple of these

Each "TestProject" class can contain its files and things like named breakpoint locations.

* Split expression evaluation tests into own file

* Include last response in error messages

* Update expectations based on current bugs

* Fix async-ness in tests

* Fix incorrect expectation in test

* Fix incorrect evaluations

* Remove skips for tests that are now passing on master

* Expect pass on Linux

🤷‍♂️

* Call the code

* Skip expression evaluation tests on Windows

* Skip whole group, not just one test

* Remove duplicated method from merge

* Fix misplaced close of group

* Remove code that was duplicated from test we copied

Not sure how this ended up in here?

* Re-fix typo

Added animation to segmented control widget.

This allows us to collect code coverage for Fuchsia tests.

A significant amonut of code uses defaultTargetPlatform, so it's
currently impossible to run most apps on Windows. This adds a mapping
from Windows as a host to Android as a target, paralleling the
macOS->iOS and Linux->Android mappings.

This allows more use of Windows as a host platform (e.g., for testing,
as in issue #17768).

This will let us re-use that code from fuchsia_tester.dart.
Tested by running the stocks example tests with coverage collection before and after.
.lcov files are identical.

Put the nav bar padding inside the CustomMultiChildLayout for correct centering and allow custom padding (#19129)

* adjust declared types to work with dart 2 typing at runtime

* review comments

* update packages/flutter_tools/lib/src/ios/simulators.dart

* Fix path of ios module template files

* Fix more paths

* Add additional functionality to integration test driver

* Typo

* Remove delays we shouldn't need + comments

* Fix typos