diff --git a/gallery/README.md b/gallery/README.md
index 7f140ae37..d11c85c73 100644
--- a/gallery/README.md
+++ b/gallery/README.md
@@ -65,7 +65,7 @@ for more details):
 flutter pub run grinder l10n
 ```
 
-To generate code segments (see separate [README](codeviewer_cli/README.md) for
+To generate code segments (see separate [README](gallery/tool/codeviewer_cli/README.md) for
 more details):
 ```
 flutter pub run grinder update-code-segments
diff --git a/gallery/gallery/tool/grind.dart b/gallery/gallery/tool/grind.dart
index 37863631f..220105d11 100644
--- a/gallery/gallery/tool/grind.dart
+++ b/gallery/gallery/tool/grind.dart
@@ -47,10 +47,32 @@ Future<void> generateLocalizations() async {
 @Task('Transform arb to xml for English')
 @Depends(generateLocalizations)
 Future<void> l10n() async {
-  final l10nPath = path.join(Directory.current.parent.path, 'l10n_cli');
-  await pubGet(directory: l10nPath);
+  final l10nPath =
+      path.join(Directory.current.path, 'tool', 'l10n_cli', 'main.dart');
+  Dart.run(l10nPath);
+}
+
+@Task('Verify xml localizations')
+Future<void> verifyL10n() async {
+  final l10nPath =
+      path.join(Directory.current.path, 'tool', 'l10n_cli', 'main.dart');
+
+  // Run the tool to transform arb to xml, and write the output to stdout.
+  final xmlOutput = Dart.run(l10nPath, arguments: ['--dry-run'], quiet: true);
+
+  // Read the original xml file.
+  final xmlPath =
+      path.join(Directory.current.path, 'lib', 'l10n', 'intl_en_US.xml');
+  final expectedXmlOutput = await File(xmlPath).readAsString();
 
-  Dart.run(path.join(l10nPath, 'bin', 'main.dart'));
+  if (xmlOutput.trim() != expectedXmlOutput.trim()) {
+    stderr.writeln(
+      'The contents of $xmlPath are different from that produced by '
+      'l10n_cli. Did you forget to run `flutter pub run grinder '
+      'l10n` after updating an .arb file?',
+    );
+    exit(1);
+  }
 }
 
 @Task('Update code segments')
diff --git a/gallery/gallery/tool/l10n_cli/README.md b/gallery/gallery/tool/l10n_cli/README.md
new file mode 100644
index 000000000..3499698e4
--- /dev/null
+++ b/gallery/gallery/tool/l10n_cli/README.md
@@ -0,0 +1,4 @@
+# l10n
+
+A command-line application that converts .arb files to .xml files for
+translation consumption.
\ No newline at end of file
diff --git a/gallery/l10n_cli/lib/l10n_cli.dart b/gallery/gallery/tool/l10n_cli/l10n_cli.dart
similarity index 85%
rename from gallery/l10n_cli/lib/l10n_cli.dart
rename to gallery/gallery/tool/l10n_cli/l10n_cli.dart
index 16c089bcd..2991f1213 100644
--- a/gallery/l10n_cli/lib/l10n_cli.dart
+++ b/gallery/gallery/tool/l10n_cli/l10n_cli.dart
@@ -37,24 +37,29 @@ String _escapeXml(String xml) {
 }
 
 /// Processes the XML files.
-Future<void> englishArbsToXmls() async {
+Future<void> englishArbsToXmls({bool isDryRun = false}) async {
+  IOSink output =
+      isDryRun ? stdout : File('$_l10nDir/intl_en_US.xml').openWrite();
   await generateXmlFromArb(
     inputArb: File('$_l10nDir/intl_en_US.arb'),
-    outputXml: File('$_l10nDir/intl_en_US.xml'),
+    outputXml: output,
     xmlHeader: _intlHeader,
   );
+  await output.close();
 }
 
 @visibleForTesting
 Future<void> generateXmlFromArb({
   File inputArb,
-  File outputXml,
+  IOSink outputXml,
   String xmlHeader,
 }) async {
-  final Map<String, dynamic> bundle = jsonDecode(await inputArb.readAsString());
+  final Map<String, dynamic> bundle =
+      jsonDecode(await inputArb.readAsString()) as Map<String, dynamic>;
+
   String translationFor(String key) {
     assert(bundle[key] != null);
-    return _escapeXml(bundle[key]);
+    return _escapeXml(bundle[key] as String);
   }
 
   final xml = StringBuffer(xmlHeader);
@@ -70,9 +75,9 @@ Future<void> generateXmlFromArb({
 
     final resourceId = key.substring(1);
     final name = _escapeXml(resourceId);
-    final Map<String, dynamic> metaInfo = bundle[key];
+    final metaInfo = bundle[key] as Map<String, dynamic>;
     assert(metaInfo != null && metaInfo['description'] != null);
-    var description = _escapeXml(metaInfo['description']);
+    var description = _escapeXml(metaInfo['description'] as String);
 
     if (metaInfo.containsKey('plural')) {
       // Generate a plurals resource element formatted like this:
@@ -110,8 +115,8 @@ Future<void> generateXmlFromArb({
       // description's 'parameters' value, are replaced with printf positional
       // string arguments, like "%1$s".
       var translation = translationFor(resourceId);
-      assert(metaInfo['parameters'].trim().isNotEmpty);
-      final parameters = metaInfo['parameters']
+      assert((metaInfo['parameters'] as String).trim().isNotEmpty);
+      final parameters = (metaInfo['parameters'] as String)
           .split(',')
           .map<String>((s) => s.trim())
           .toList();
@@ -139,6 +144,5 @@ Future<void> generateXmlFromArb({
     }
   }
   xml.writeln('</resources>');
-
-  await outputXml.writeAsString(xml.toString());
+  outputXml.write(xml.toString());
 }
diff --git a/gallery/gallery/tool/l10n_cli/main.dart b/gallery/gallery/tool/l10n_cli/main.dart
new file mode 100644
index 000000000..6d7869952
--- /dev/null
+++ b/gallery/gallery/tool/l10n_cli/main.dart
@@ -0,0 +1,17 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:args/args.dart';
+
+import 'l10n_cli.dart' as l10n_cli;
+
+void main(List<String> arguments) {
+  final parser = ArgParser()
+    ..addFlag(
+      'dry-run',
+      help: 'Write the output to stdout.',
+    );
+  final argResults = parser.parse(arguments);
+  l10n_cli.englishArbsToXmls(isDryRun: argResults['dry-run'] as bool);
+}
diff --git a/gallery/l10n_cli/.gitignore b/gallery/l10n_cli/.gitignore
deleted file mode 100644
index 474008f49..000000000
--- a/gallery/l10n_cli/.gitignore
+++ /dev/null
@@ -1,13 +0,0 @@
-# Files and directories created by pub
-.dart_tool/
-.packages
-# Remove the following pattern if you wish to check in your lock file
-pubspec.lock
-
-# Conventional directory for build outputs
-build/
-
-# Directory created by dartdoc
-doc/api/
-
-.DS_Store
diff --git a/gallery/l10n_cli/CHANGELOG.md b/gallery/l10n_cli/CHANGELOG.md
deleted file mode 100644
index 687440bac..000000000
--- a/gallery/l10n_cli/CHANGELOG.md
+++ /dev/null
@@ -1,3 +0,0 @@
-## 1.0.0
-
-- Initial version, created by Stagehand
diff --git a/gallery/l10n_cli/README.md b/gallery/l10n_cli/README.md
deleted file mode 100644
index 151472559..000000000
--- a/gallery/l10n_cli/README.md
+++ /dev/null
@@ -1,7 +0,0 @@
-# l10n
-
-A command-line application that converts .arb files to .xml files for
-translation consumption.
-
-Created from templates made available by Stagehand under a BSD-style
-[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).
diff --git a/gallery/l10n_cli/analysis_options.yaml b/gallery/l10n_cli/analysis_options.yaml
deleted file mode 100644
index 4f4d26bc5..000000000
--- a/gallery/l10n_cli/analysis_options.yaml
+++ /dev/null
@@ -1,39 +0,0 @@
-# Defines a default set of lint rules enforced for
-# projects at Google. For details and rationale,
-# see https://github.com/dart-lang/pedantic#enabled-lints.
-include: package:pedantic/analysis_options.yaml
-
-# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
-# Uncomment to specify additional rules.
-# linter:
-#   rules:
-#     - camel_case_types
-
-analyzer:
-#   exclude:
-#     - path/to/excluded/files/**
-
-linter:
-  rules:
-    - avoid_types_on_closure_parameters
-    - avoid_void_async
-    - await_only_futures
-    - camel_case_types
-    - cancel_subscriptions
-    - close_sinks
-    - constant_identifier_names
-    - control_flow_in_finally
-    - empty_statements
-    - hash_and_equals
-    - implementation_imports
-    - non_constant_identifier_names
-    - package_api_docs
-    - package_names
-    - package_prefixed_library_names
-    - test_types_in_equals
-    - throw_in_finally
-    - unnecessary_brace_in_string_interps
-    - unnecessary_getters_setters
-    - unnecessary_new
-    - unnecessary_statements
-    - directives_ordering
diff --git a/gallery/l10n_cli/bin/main.dart b/gallery/l10n_cli/bin/main.dart
deleted file mode 100644
index b92a74dee..000000000
--- a/gallery/l10n_cli/bin/main.dart
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2019 The Flutter team. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:l10n_cli/l10n_cli.dart' as l10n_cli;
-
-main(List<String> arguments) async {
-  await l10n_cli.englishArbsToXmls();
-}
diff --git a/gallery/l10n_cli/pubspec.yaml b/gallery/l10n_cli/pubspec.yaml
deleted file mode 100644
index 234e9876e..000000000
--- a/gallery/l10n_cli/pubspec.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-name: l10n_cli
-description: A sample command-line application.
-# version: 1.0.0
-# author: Rami Abou Ghanem <raboughanem@google.com>
-
-environment:
-  sdk: '>=2.2.0 <3.0.0'
-
-dev_dependencies:
-  pedantic: 1.8.0
-  test: ^1.0.0
diff --git a/tool/travis_flutter_script.sh b/tool/travis_flutter_script.sh
index 347145130..4a8a616aa 100755
--- a/tool/travis_flutter_script.sh
+++ b/tool/travis_flutter_script.sh
@@ -59,10 +59,14 @@ do
 done
 
 # Test that the code segment widgets that get displayed in the Flutter Material
-# gallery have been generated using the latest gallery code.
-echo "Run code segments check for 'gallery/gallery'."
+# gallery have been generated using the latest gallery code. Also test that
+# the localization scripts have been run, so that they are up to date for the
+# gallery.
 pushd gallery/gallery
+echo "Run code segments check for 'gallery/gallery'."
 "${LOCAL_SDK_PATH}/bin/flutter" pub run grinder verify-code-segments
+echo "Run localization check for 'gallery/gallery'."
+"${LOCAL_SDK_PATH}/bin/flutter" pub run grinder verify-l10n
 popd
 
 echo "-- Success --"