Normalize localizations with dartfmt in presubmit check (#160395)

Makes the presubmit check independent of whether the files in the repo
are dartfmt formatted or not.

dev/bots/analyze.dart

@@ -14,6 +14,7 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:collection/equality.dart';
 import 'package:crypto/crypto.dart';
+import 'package:dart_style/dart_style.dart';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as path;
 
@@ -1042,6 +1043,8 @@ Future<void> verifyIntegrationTestTimeouts(String workingDirectory) async {
   }
 }
 
+final DartFormatter _formatter = DartFormatter(languageVersion: DartFormatter.latestLanguageVersion);
+
 Future<void> verifyInternationalizations(String workingDirectory, String dartExecutable) async {
   final EvalResult materialGenResult = await _evalCommand(
     dartExecutable,
@@ -1067,24 +1070,30 @@ Future<void> verifyInternationalizations(String workingDirectory, String dartExe
   final String expectedMaterialResult = await File(materialLocalizationsFile).readAsString();
   final String expectedCupertinoResult = await File(cupertinoLocalizationsFile).readAsString();
 
-  if (materialGenResult.stdout.trim() != expectedMaterialResult.trim()) {
+  // Normalize both with the Dart formatter.
+  final String formattedMaterialGenResult = _formatter.format(materialGenResult.stdout.trim());
+  final String formattedExpectedMaterialResult = _formatter.format(expectedMaterialResult.trim());
+
+  if (formattedMaterialGenResult != formattedExpectedMaterialResult) {
     foundError(<String>[
       '<<<<<<< $materialLocalizationsFile',
-      expectedMaterialResult.trim(),
+      formattedExpectedMaterialResult,
       '=======',
-      materialGenResult.stdout.trim(),
+      formattedMaterialGenResult,
       '>>>>>>> gen_localizations',
       'The contents of $materialLocalizationsFile are different from that produced by gen_localizations.',
       '',
       'Did you forget to run gen_localizations.dart after updating a .arb file?',
     ]);
   }
-  if (cupertinoGenResult.stdout.trim() != expectedCupertinoResult.trim()) {
+  final String formattedCupertinoGenResult = _formatter.format(cupertinoGenResult.stdout.trim());
+  final String formattedExpectedCupertinoResult = _formatter.format(expectedCupertinoResult.trim());
+  if (formattedCupertinoGenResult != formattedExpectedCupertinoResult) {
     foundError(<String>[
       '<<<<<<< $cupertinoLocalizationsFile',
-      expectedCupertinoResult.trim(),
+      formattedExpectedCupertinoResult,
       '=======',
-      cupertinoGenResult.stdout.trim(),
+      formattedCupertinoGenResult,
       '>>>>>>> gen_localizations',
       'The contents of $cupertinoLocalizationsFile are different from that produced by gen_localizations.',
       '',

dev/bots/pubspec.yaml

@@ -8,6 +8,7 @@ dependencies:
   analyzer: 6.11.0
   args: 2.6.0
   crypto: 3.0.6
+  dart_style: 2.3.7
   intl: 0.19.0
   file: 7.0.1
   flutter_devicelab:
@@ -77,4 +78,4 @@ dependencies:
 dev_dependencies:
   test_api: 0.7.4
 
-# PUBSPEC CHECKSUM: cbf1
+# PUBSPEC CHECKSUM: e284