* Only printError on our simple messages

Any other type is a real error that should be a normal crash (to get a proper error log).

See #19453.

* Add toList() to convert Iterable<String> -> List<String>

This code previously throw in Dart-2 mode.

Fixes #19453.

* Move getSimulatorPath into Xcode

* Add a test that we tried to launch the simulator

* Remove unused import

* Add sample of multicolumn picker to Flutter Gallery
* Modify CupertinoPicker to be able to be rendered off-center.

Flutter app development has been Dart 2 only for a significant amount of
time, and we're about to remove all support for Dart 1.

Currently only Android views are supported.

This also includes a FakePlatformViewsController which is a fake
implementation of the engine side for testing.

Cirrus CI has macOS VMs, so this turns on an instance for tests so that we can evaluate if we can use Cirrus for all three platforms or not.

Makes them all be generated on Linux and fixes some to not be so large.

Bug: https://github.com/flutter/flutter/issues/19435

Bug: https://github.com/flutter/flutter/issues/19494

Fixes https://github.com/flutter/flutter/issues/19465

This reverts commit b0eb1632.

This reverts commit cc1cf13e.

* Chevrons in month picker are semi-transparent when the month is scrolled

* Added type missing annotation

This reverts commit 57d78cc7.

This reverts commit 44995dc4.

This uses @kevmoo's completion package to do command line completion for flutter, and a new command "bash-completion" (with alias "zsh-completion") that will output the necessary shell script setup code, and adds the hidden command "completion" that does the actual completion.

Because it adds a dependency, I also had to do flutter update-packages --force-upgrade.

Fixes #18988.

This reverts commit e22f9974.

Adding the exit(exitCode) fixes the hang.
Tested by running `fx run-host-tests` with a topaz checkout.
Verified the hang before, no hang after.

Revert "Revert "Roll engine to fed2ea458ed49088d33eddabc546ba56d600c717 (includes dart roll) again (#19277)" (#19295)" (#19322)

This reverts commit cc122f16.

This reverts commit 032f8cdb.

The test runner hangs on exit after all tests pass when trying
to roll this into Fuchsia.

* Preserve original kernel file for isolate spawn requests.

This change gives incremental kernel files ".incremental.dill" extension thereby preserving original kernel file.

Bug: https://github.com/flutter/flutter/issues/16084
Bug: https://github.com/flutter/flutter/issues/17012
Bug: https://github.com/flutter/flutter/issues/17983

* Factor out naming logic into separate function

* Fix string vs uri

* Allow a longer timeout for app launches

* Include timings in errors when waiting for events

* Extract a helper that adds a timeout and includes message logging

* Ensure all timeouts include messages

* Ensure logs are set up before we invoke actions

* Ensure all messages are logged during timeout periods

This adds a new stream _allMessages that collects all output (as routed through debugPrint) and updates _timeoutWithMessages to use that instead of stdin/out of only the flutter run process (since that was missing stdin - the sends, and both input/output to the VM service).