* Tell flutter to quit directly

Fixes #19208.

* Tweak comment

We don't actually care if we're on linux, we care only if the lcov
tool is available. We check for that explicitly just below.
Additionally there is code below which indicates that lcov is available
for macOS. Before this change that code would never execute.

* re-enable lint unnecessary_const

* remove trailling whitespaces

* remove unnecessary const (after merge)

* Change material refresh indicator onRefresh signature from Future<Null> to Future<void>.

* Update authors.

* Explicitly name void argument.

RenderAndroidView is responsible for sizing and displaying an embedded
Android view.
AndroidView is responsible for creating and disposing the Android view
and is using RenderAndroidView to display it.

* Changed duration

* Fixed column width for ios build error messages

* fixed a couple things

* fixed a couple things

* accidental changes

* added spaces

* added spaces

* Added test for default snackbar duration

* Fixed link:

* Final commit

* Final commit2

* Actual final commit

* Remove uses of deprecated constants
* Change int.parse to int.tryParse where appropriate

The verbosity change is to help track down timeouts that currently look like:

```
C:\Windows\Temp\flutter sdk>call bin\flutter.bat config --no-analytics
Checking Dart SDK version...
Downloading Dart SDK from Flutter engine c5a63d28bf3735569c8187753bc490d8351a8363...
Unzipping Dart SDK...
Updating flutter tool...
```

Follow-up to https://github.com/flutter/flutter/pull/18562, which passed Travis before the check was added.

Checks only changed source files (C++, Dart, Java, ObjC) for trailing whitespace.

With a fix of a path being printed relative instead of absolute.

482469bad Roll Dart to 937ee2e8ca4b76499e24cd463f07bfb736bccd74. (#5800)
bb323c145 Revert "Roll src/third_party/skia 9e0d7e4072e4..297c3c8e85bd (62 commits) (#5802)" (#5803)
0bf69f02d Roll src/third_party/skia 9e0d7e4072e4..297c3c8e85bd (62 commits) (#5802)

5d0e13a45 Fix starting isolate directly from CoreJIT snapshot. (#5798)

09ff9493e Re-land removal of vmservice_io from release builds. (#5784)
b523ee847 Revert "Switch to Fuchsia's ICU (#5774)" (#5801)
69695493b Switch to Fuchsia's ICU (#5774)

55b423f07 Ensure assistiveTechnologyEnabled is initialized when the android view is set up (#5793)
3054f3183 Add touch events to the platform views method channel API. (#5796)
91c16af0c Revert "Roll Dart to 937ee2e8ca4b76499e24cd463f07bfb736bccd74. (#5745)" (#5799)
1a66f895b Roll Dart to 937ee2e8ca4b76499e24cd463f07bfb736bccd74. (#5745)
8d046a727 Revert "Roll src/third_party/skia 9e0d7e4072e4..8f8bf8880d9d (32 commits) (#5794)" (#5797)
e8d172cf3 Revert "Fix Dart 2 reload when running from a snapshot instead of platform.dill. (#5792)" (#5795)
624cf7e25 Fix Dart 2 reload when running from a snapshot instead of platform.dill. (#5792)
16da4710d Roll src/third_party/skia 9e0d7e4072e4..8f8bf8880d9d (32 commits) (#5794)
3fe63fd5d Add presubmit check for engine to flutter roll (#5790)

Added textInputAction parameter to TextFormField that forwards to TextField, added onEditingComplete parameter to TextField that forwards to EditableText, added onEditingComplete parameter to TextFormField that forwards to TextField. (#19397) (#19427)

Fixes https://github.com/flutter/flutter/issues/18971

Generated.xcconfig is only required at build time for iOS apps. In the
flutter create project template and example apps, Generated.xcconfig was
previously marked as a resource to be bundled into the built app.

While working on attach, I changed the message output while waiting for an app to connect but didn't catch this.

* Extract some of startApp into a reusable method

* Get basic attach --machine working

* Attach --machine tweaks

Move validation to validate method and create daemon early so we get the startup event before trying to get a connection.

* Bump daemon version so we know whether it's valid to flutter attach

* Tweak output text

* Swap package imports for relative

* Review tweaks (naming, formatting, typedefs)

* Separate arguments from process spawning

This will make calling attach easier

* Add a basic test for flutter attach --machine

* Fix crash if port unforward modifies the list of forwarded ports

* Add a no-op port forwarder for flutter-tester

* Switch to using BasicProject instead of our own inline code

* Fix expectation in test now we have a portForwarder

* Remove stale TODO (this is done)

* Tweak formatting

* Change some Completers to void to fix Dart 2 issues

* Make cleanup of flutter processes in tests more reliable

* Fix quit signals

I confused SigInt&SigTerm for SigTerm&SigKill when I first did this. SigTerm can be blocked and doesn't guarantee the process will be terminated.

* Don't use deprecated constants

* Fix typo

* Add some additional info to debug buffer

* Fix return types on Futures

* 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.