[Gallery] Fix directory structure (#312)

gallery/lib/studies/crane/model/formatters.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:flutter/material.dart';
+import 'package:gallery/l10n/gallery_localizations.dart';
+
+// Duration of time (e.g. 16h 12m)
+String formattedDuration(BuildContext context, Duration duration,
+    {bool abbreviated}) {
+  final hoursShortForm =
+      GalleryLocalizations.of(context).craneHours(duration.inHours.toInt());
+  final minutesShortForm =
+      GalleryLocalizations.of(context).craneMinutes(duration.inMinutes % 60);
+  return GalleryLocalizations.of(context)
+      .craneFlightDuration(hoursShortForm, minutesShortForm);
+}