Add:创建 flutter go web 版

packages/flutter_web/test/widgets/media_query_test.dart

@@ -0,0 +1,45 @@
+// Copyright 2015 The Chromium Authors. 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_web/material.dart';
+import 'package:flutter_web_test/flutter_web_test.dart';
+import 'package:flutter_web_ui/ui.dart' as ui;
+
+void main() {
+  group('$MediaQuery', () {
+    setUp(() {
+      width = null;
+      height = null;
+      pixelRatio = null;
+    });
+
+    testWidgets('provides window properties', (WidgetTester tester) async {
+      var testMediaWidget = new TestMediaWidget();
+      await tester.pumpWidget(
+        new MediaQuery(
+          data: new MediaQueryData.fromWindow(ui.window),
+          child: testMediaWidget,
+        ),
+      );
+      expect(width, isNotNull);
+      expect(height, isNotNull);
+      expect(pixelRatio, isNotNull);
+    });
+  });
+}
+
+double width;
+double height;
+double pixelRatio;
+
+class TestMediaWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    var data = MediaQuery.of(context);
+    width = data.size.width;
+    height = data.size.height;
+    pixelRatio = data.devicePixelRatio;
+    return new Text('dummy text', textDirection: TextDirection.ltr);
+  }
+}