Add flutter_web samples (#75)

web/charts/example/lib/i18n/i18n_gallery.dart

@@ -0,0 +1,50 @@
+// Copyright 2018 the Charts project authors. Please see the AUTHORS file
+// for details.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'package:flutter_web/material.dart';
+import '../gallery_scaffold.dart';
+import 'rtl_bar_chart.dart';
+import 'rtl_line_chart.dart';
+import 'rtl_line_segments.dart';
+import 'rtl_series_legend.dart';
+
+List<GalleryScaffold> buildGallery() {
+  return [
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.flag),
+      title: 'RTL Bar Chart',
+      subtitle: 'Simple bar chart in RTL',
+      childBuilder: () => new RTLBarChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.flag),
+      title: 'RTL Line Chart',
+      subtitle: 'Simple line chart in RTL',
+      childBuilder: () => new RTLLineChart.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.flag),
+      title: 'RTL Line Segments',
+      subtitle: 'Stacked area chart with style segments in RTL',
+      childBuilder: () => new RTLLineSegments.withRandomData(),
+    ),
+    new GalleryScaffold(
+      listTileIcon: new Icon(Icons.flag),
+      title: 'RTL Series Legend',
+      subtitle: 'Series legend in RTL',
+      childBuilder: () => new RTLSeriesLegend.withRandomData(),
+    ),
+  ];
+}