format initializer list of constructors (#27111)

diff --git a/packages/flutter_tools/lib/src/android/android_emulator.dart b/packages/flutter_tools/lib/src/android/android_emulator.dart
index bce4062..5d6daf8 100644
--- a/packages/flutter_tools/lib/src/android/android_emulator.dart
+++ b/packages/flutter_tools/lib/src/android/android_emulator.dart
@@ -27,7 +27,7 @@
 
 class AndroidEmulator extends Emulator {
   AndroidEmulator(String id, [this._properties])
-      : super(id, _properties != null && _properties.isNotEmpty);
+    : super(id, _properties != null && _properties.isNotEmpty);
 
   Map<String, String> _properties;
 
diff --git a/packages/flutter_tools/lib/src/android/android_workflow.dart b/packages/flutter_tools/lib/src/android/android_workflow.dart
index 00431f0..2ac566f 100644
--- a/packages/flutter_tools/lib/src/android/android_workflow.dart
+++ b/packages/flutter_tools/lib/src/android/android_workflow.dart
@@ -51,7 +51,7 @@
 }
 
 class AndroidValidator extends DoctorValidator {
-  AndroidValidator(): super('Android toolchain - develop for Android devices',);
+  AndroidValidator() : super('Android toolchain - develop for Android devices',);
 
   @override
   String get slowWarning => '${_task ?? 'This'} is taking a long time...';
@@ -167,7 +167,7 @@
 }
 
 class AndroidLicenseValidator extends DoctorValidator {
-  AndroidLicenseValidator(): super('Android license subvalidator',);
+  AndroidLicenseValidator() : super('Android license subvalidator',);
 
   @override
   String get slowWarning => 'Checking Android licenses is taking an unexpectedly long time...';
diff --git a/packages/flutter_tools/lib/src/artifacts.dart b/packages/flutter_tools/lib/src/artifacts.dart
index 371a042..6cfb8bc 100644
--- a/packages/flutter_tools/lib/src/artifacts.dart
+++ b/packages/flutter_tools/lib/src/artifacts.dart
@@ -76,9 +76,11 @@
 }
 
 class EngineBuildPaths {
-  const EngineBuildPaths({ @required this.targetEngine, @required this.hostEngine }):
-      assert(targetEngine != null),
-      assert(hostEngine != null);
+  const EngineBuildPaths({
+    @required this.targetEngine,
+    @required this.hostEngine,
+  }) : assert(targetEngine != null),
+       assert(hostEngine != null);
 
   final String targetEngine;
   final String hostEngine;
diff --git a/packages/flutter_tools/lib/src/base/process.dart b/packages/flutter_tools/lib/src/base/process.dart
index 40e085e..077b32e 100644
--- a/packages/flutter_tools/lib/src/base/process.dart
+++ b/packages/flutter_tools/lib/src/base/process.dart
@@ -361,7 +361,9 @@
 }
 
 class RunResult {
-  RunResult(this.processResult, this._command) : assert(_command != null), assert(_command.isNotEmpty);
+  RunResult(this.processResult, this._command)
+    : assert(_command != null),
+      assert(_command.isNotEmpty);
 
   final ProcessResult processResult;
 
diff --git a/packages/flutter_tools/lib/src/base/terminal.dart b/packages/flutter_tools/lib/src/base/terminal.dart
index de7f012..8f9eb45 100644
--- a/packages/flutter_tools/lib/src/base/terminal.dart
+++ b/packages/flutter_tools/lib/src/base/terminal.dart
@@ -42,9 +42,9 @@
     bool wrapText,
     int wrapColumn,
     bool showColor,
-  })  : wrapText = wrapText ?? io.stdio?.hasTerminal ?? const io.Stdio().hasTerminal,
-        _overrideWrapColumn = wrapColumn,
-        showColor = showColor ?? platform.stdoutSupportsAnsi ?? false;
+  }) : wrapText = wrapText ?? io.stdio?.hasTerminal ?? const io.Stdio().hasTerminal,
+       _overrideWrapColumn = wrapColumn,
+       showColor = showColor ?? platform.stdoutSupportsAnsi ?? false;
 
   /// If [wrapText] is true, then any text sent to the context's [Logger]
   /// instance (e.g. from the [printError] or [printStatus] functions) will be
diff --git a/packages/flutter_tools/lib/src/cache.dart b/packages/flutter_tools/lib/src/cache.dart
index dd1db59..fe5089e 100644
--- a/packages/flutter_tools/lib/src/cache.dart
+++ b/packages/flutter_tools/lib/src/cache.dart
@@ -348,7 +348,7 @@
 
 /// A cached artifact containing fonts used for Material Design.
 class MaterialFonts extends CachedArtifact {
-  MaterialFonts(Cache cache): super('material_fonts', cache);
+  MaterialFonts(Cache cache) : super('material_fonts', cache);
 
   @override
   Future<void> updateInner() {
@@ -359,7 +359,7 @@
 
 /// A cached artifact containing the Flutter engine binaries.
 class FlutterEngine extends CachedArtifact {
-  FlutterEngine(Cache cache): super('engine', cache);
+  FlutterEngine(Cache cache) : super('engine', cache);
 
   List<String> _getPackageDirs() => const <String>['sky_engine'];
 
@@ -574,7 +574,7 @@
 
 /// A cached artifact containing Gradle Wrapper scripts and binaries.
 class GradleWrapper extends CachedArtifact {
-  GradleWrapper(Cache cache): super('gradle_wrapper', cache);
+  GradleWrapper(Cache cache) : super('gradle_wrapper', cache);
 
   List<String> get _gradleScripts => <String>['gradlew', 'gradlew.bat'];
 
diff --git a/packages/flutter_tools/lib/src/commands/update_packages.dart b/packages/flutter_tools/lib/src/commands/update_packages.dart
index efe4d91..f1f9d3d 100644
--- a/packages/flutter_tools/lib/src/commands/update_packages.dart
+++ b/packages/flutter_tools/lib/src/commands/update_packages.dart
@@ -903,7 +903,8 @@
     DependencyKind kind,
     this.version,
     this.sourcePath,
-  }) : _kind = kind, super(line);
+  }) : _kind = kind,
+       super(line);
 
   static PubspecDependency parse(String line, { @required String filename }) {
     // We recognize any line that:
diff --git a/packages/flutter_tools/lib/src/compile.dart b/packages/flutter_tools/lib/src/compile.dart
index 29fa0c6..3a24d54 100644
--- a/packages/flutter_tools/lib/src/compile.dart
+++ b/packages/flutter_tools/lib/src/compile.dart
@@ -286,9 +286,13 @@
 }
 
 class _RecompileRequest extends _CompilationRequest {
-  _RecompileRequest(Completer<CompilerOutput> completer, this.mainPath,
-      this.invalidatedFiles, this.outputPath, this.packagesFilePath) :
-      super(completer);
+  _RecompileRequest(
+    Completer<CompilerOutput> completer,
+    this.mainPath,
+    this.invalidatedFiles,
+    this.outputPath,
+    this.packagesFilePath,
+  ) : super(completer);
 
   String mainPath;
   List<String> invalidatedFiles;
@@ -301,9 +305,15 @@
 }
 
 class _CompileExpressionRequest extends _CompilationRequest {
-  _CompileExpressionRequest(Completer<CompilerOutput> completer, this.expression, this.definitions,
-      this.typeDefinitions, this.libraryUri, this.klass, this.isStatic) :
-      super(completer);
+  _CompileExpressionRequest(
+    Completer<CompilerOutput> completer,
+    this.expression,
+    this.definitions,
+    this.typeDefinitions,
+    this.libraryUri,
+    this.klass,
+    this.isStatic
+  ) : super(completer);
 
   String expression;
   List<String> definitions;
diff --git a/packages/flutter_tools/lib/src/dart/dependencies.dart b/packages/flutter_tools/lib/src/dart/dependencies.dart
index 0b7fa12..f931b09 100644
--- a/packages/flutter_tools/lib/src/dart/dependencies.dart
+++ b/packages/flutter_tools/lib/src/dart/dependencies.dart
@@ -26,10 +26,10 @@
 }
 
 class DartDependencySetBuilder {
-  DartDependencySetBuilder(String mainScriptPath, String packagesFilePath) :
-    _mainScriptPath = canonicalizePath(mainScriptPath),
-    _mainScriptUri = fs.path.toUri(mainScriptPath),
-    _packagesFilePath = canonicalizePath(packagesFilePath);
+  DartDependencySetBuilder(String mainScriptPath, String packagesFilePath)
+    : _mainScriptPath = canonicalizePath(mainScriptPath),
+      _mainScriptUri = fs.path.toUri(mainScriptPath),
+      _packagesFilePath = canonicalizePath(packagesFilePath);
 
   final String _mainScriptPath;
   final String _packagesFilePath;
diff --git a/packages/flutter_tools/lib/src/devfs.dart b/packages/flutter_tools/lib/src/devfs.dart
index 75ebec8..dece857 100644
--- a/packages/flutter_tools/lib/src/devfs.dart
+++ b/packages/flutter_tools/lib/src/devfs.dart
@@ -193,7 +193,9 @@
 
 /// String content to be copied to the device.
 class DevFSStringContent extends DevFSByteContent {
-  DevFSStringContent(String string) : _string = string, super(utf8.encode(string));
+  DevFSStringContent(String string)
+    : _string = string,
+      super(utf8.encode(string));
 
   String _string;
 
@@ -274,7 +276,7 @@
 
 class _DevFSHttpWriter {
   _DevFSHttpWriter(this.fsName, VMService serviceProtocol)
-      : httpAddress = serviceProtocol.httpAddress;
+    : httpAddress = serviceProtocol.httpAddress;
 
   final String fsName;
   final Uri httpAddress;
@@ -377,25 +379,25 @@
 
 class DevFS {
   /// Create a [DevFS] named [fsName] for the local files in [rootDirectory].
-  DevFS(VMService serviceProtocol,
-        this.fsName,
-        this.rootDirectory, {
-        String packagesFilePath
-      })
-    : _operations = ServiceProtocolDevFSOperations(serviceProtocol),
-      _httpWriter = _DevFSHttpWriter(fsName, serviceProtocol) {
+  DevFS(
+    VMService serviceProtocol,
+    this.fsName,
+    this.rootDirectory, {
+    String packagesFilePath
+  }) : _operations = ServiceProtocolDevFSOperations(serviceProtocol),
+       _httpWriter = _DevFSHttpWriter(fsName, serviceProtocol) {
     _packagesFilePath =
         packagesFilePath ?? fs.path.join(rootDirectory.path, kPackagesFileName);
   }
 
-  DevFS.operations(this._operations,
-                   this.fsName,
-                   this.rootDirectory, {
-                   String packagesFilePath,
-      })
-    : _httpWriter = null {
-    _packagesFilePath =
-        packagesFilePath ?? fs.path.join(rootDirectory.path, kPackagesFileName);
+  DevFS.operations(
+    this._operations,
+    this.fsName,
+    this.rootDirectory, {
+    String packagesFilePath,
+  }) : _httpWriter = null {
+       _packagesFilePath =
+           packagesFilePath ?? fs.path.join(rootDirectory.path, kPackagesFileName);
   }
 
   final DevFSOperations _operations;
diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 9d46ffe..d932fd4 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -361,15 +361,15 @@
     this.observatoryPort,
    }) : debuggingEnabled = true;
 
-  DebuggingOptions.disabled(this.buildInfo) :
-    debuggingEnabled = false,
-    useTestFonts = false,
-    startPaused = false,
-    enableSoftwareRendering = false,
-    skiaDeterministicRendering = false,
-    traceSkia = false,
-    traceSystrace = false,
-    observatoryPort = null;
+  DebuggingOptions.disabled(this.buildInfo)
+    : debuggingEnabled = false,
+      useTestFonts = false,
+      startPaused = false,
+      enableSoftwareRendering = false,
+      skiaDeterministicRendering = false,
+      traceSkia = false,
+      traceSystrace = false,
+      observatoryPort = null;
 
   final bool debuggingEnabled;
 
@@ -387,7 +387,9 @@
 
 class LaunchResult {
   LaunchResult.succeeded({ this.observatoryUri }) : started = true;
-  LaunchResult.failed() : started = false, observatoryUri = null;
+  LaunchResult.failed()
+    : started = false,
+      observatoryUri = null;
 
   bool get hasObservatory => observatoryUri != null;
 
diff --git a/packages/flutter_tools/lib/src/ios/devices.dart b/packages/flutter_tools/lib/src/ios/devices.dart
index d250ea0..a68bcfb 100644
--- a/packages/flutter_tools/lib/src/ios/devices.dart
+++ b/packages/flutter_tools/lib/src/ios/devices.dart
@@ -111,7 +111,9 @@
 }
 
 class IOSDevice extends Device {
-  IOSDevice(String id, { this.name, String sdkVersion }) : _sdkVersion = sdkVersion, super(id) {
+  IOSDevice(String id, { this.name, String sdkVersion })
+      : _sdkVersion = sdkVersion,
+        super(id) {
     _installerPath = _checkForCommand('ideviceinstaller');
     _iproxyPath = _checkForCommand('iproxy');
   }
diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index 5ac90fb..4c5496b 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -31,9 +31,9 @@
 class FlutterProject {
   @visibleForTesting
   FlutterProject(this.directory, this.manifest, this._exampleManifest)
-      : assert(directory != null),
-        assert(manifest != null),
-        assert(_exampleManifest != null);
+    : assert(directory != null),
+      assert(manifest != null),
+      assert(_exampleManifest != null);
 
   /// Returns a future that completes with a [FlutterProject] view of the given directory
   /// or a ToolExit error, if `pubspec.yaml` or `example/pubspec.yaml` is invalid.
diff --git a/packages/flutter_tools/lib/src/tester/flutter_tester.dart b/packages/flutter_tools/lib/src/tester/flutter_tester.dart
index de29600..30861be 100644
--- a/packages/flutter_tools/lib/src/tester/flutter_tester.dart
+++ b/packages/flutter_tools/lib/src/tester/flutter_tester.dart
@@ -27,8 +27,8 @@
   }
 
   FlutterTesterApp._(Directory directory)
-      : _directory = directory,
-        super(id: directory.path);
+    : _directory = directory,
+      super(id: directory.path);
 
   final Directory _directory;
 
diff --git a/packages/flutter_tools/lib/src/version.dart b/packages/flutter_tools/lib/src/version.dart
index 29dbc5e..bd65cc3 100644
--- a/packages/flutter_tools/lib/src/version.dart
+++ b/packages/flutter_tools/lib/src/version.dart
@@ -540,7 +540,12 @@
 
 class GitTagVersion {
   const GitTagVersion(this.x, this.y, this.z, this.commits, this.hash);
-  const GitTagVersion.unknown() : x = null, y = null, z = null, commits = 0, hash = '';
+  const GitTagVersion.unknown()
+    : x = null,
+      y = null,
+      z = null,
+      commits = 0,
+      hash = '';
 
   /// The X in vX.Y.Z.
   final int x;
diff --git a/packages/flutter_tools/lib/src/vmservice_record_replay.dart b/packages/flutter_tools/lib/src/vmservice_record_replay.dart
index 0061fd4..0868682 100644
--- a/packages/flutter_tools/lib/src/vmservice_record_replay.dart
+++ b/packages/flutter_tools/lib/src/vmservice_record_replay.dart
@@ -195,7 +195,7 @@
 /// replays the corresponding responses back from the recording.
 class ReplayVMServiceChannel extends StreamChannelMixin<String> {
   ReplayVMServiceChannel(Directory location)
-      : _transactions = _loadTransactions(location);
+    : _transactions = _loadTransactions(location);
 
   final Map<int, _Transaction> _transactions;
   final StreamController<String> _controller = StreamController<String>();
diff --git a/packages/flutter_tools/test/commands/doctor_test.dart b/packages/flutter_tools/test/commands/doctor_test.dart
index 95c9141..0a403cc 100644
--- a/packages/flutter_tools/test/commands/doctor_test.dart
+++ b/packages/flutter_tools/test/commands/doctor_test.dart
@@ -477,7 +477,7 @@
 }
 
 class MissingValidator extends DoctorValidator {
-  MissingValidator(): super('Missing Validator');
+  MissingValidator() : super('Missing Validator');
 
   @override
   Future<ValidationResult> validate() async {
@@ -490,7 +490,7 @@
 }
 
 class NotAvailableValidator extends DoctorValidator {
-  NotAvailableValidator(): super('Not Available Validator');
+  NotAvailableValidator() : super('Not Available Validator');
 
   @override
   Future<ValidationResult> validate() async {
@@ -622,7 +622,7 @@
 }
 
 class MissingGroupedValidator extends DoctorValidator {
-  MissingGroupedValidator(String name): super(name);
+  MissingGroupedValidator(String name) : super(name);
 
   @override
   Future<ValidationResult> validate() async {
@@ -633,7 +633,7 @@
 }
 
 class PartialGroupedValidator extends DoctorValidator {
-  PartialGroupedValidator(String name): super(name);
+  PartialGroupedValidator(String name) : super(name);
 
   @override
   Future<ValidationResult> validate() async {
@@ -702,7 +702,7 @@
 
 class VsCodeValidatorTestTargets extends VsCodeValidator {
   VsCodeValidatorTestTargets._(String installDirectory, String extensionDirectory, {String edition})
-      : super(VsCode.fromDirectory(installDirectory, extensionDirectory, edition: edition));
+    : super(VsCode.fromDirectory(installDirectory, extensionDirectory, edition: edition));
 
   static VsCodeValidatorTestTargets get installedWithExtension =>
       VsCodeValidatorTestTargets._(validInstall, validExtensions);
diff --git a/packages/flutter_tools/test/emulator_test.dart b/packages/flutter_tools/test/emulator_test.dart
index 7a7c5b4..71469fb 100644
--- a/packages/flutter_tools/test/emulator_test.dart
+++ b/packages/flutter_tools/test/emulator_test.dart
@@ -164,7 +164,7 @@
 
 class _MockEmulator extends Emulator {
   _MockEmulator(String id, this.name, this.manufacturer, this.label)
-      : super(id, true);
+    : super(id, true);
 
   @override
   final String name;
diff --git a/packages/flutter_tools/test/integration/test_driver.dart b/packages/flutter_tools/test/integration/test_driver.dart
index 0148296..b95e2c2 100644
--- a/packages/flutter_tools/test/integration/test_driver.dart
+++ b/packages/flutter_tools/test/integration/test_driver.dart
@@ -590,8 +590,8 @@
 }
 
 class FlutterTestTestDriver extends FlutterTestDriver {
-  FlutterTestTestDriver(Directory _projectFolder, {String logPrefix}):
-    super(_projectFolder, logPrefix: logPrefix);
+  FlutterTestTestDriver(Directory _projectFolder, {String logPrefix})
+    : super(_projectFolder, logPrefix: logPrefix);
 
   Future<void> test({
     String testFile = 'test/test.dart',
diff --git a/packages/flutter_tools/test/resident_runner_test.dart b/packages/flutter_tools/test/resident_runner_test.dart
index 815de93..2a20530 100644
--- a/packages/flutter_tools/test/resident_runner_test.dart
+++ b/packages/flutter_tools/test/resident_runner_test.dart
@@ -12,7 +12,7 @@
 
 class TestRunner extends ResidentRunner {
   TestRunner(List<FlutterDevice> devices)
-      : super(devices);
+    : super(devices);
 
   bool hasHelpBeenPrinted = false;
   String receivedCommand;