Update charted to 0.4.8 and roll

packages/usage/test/usage_impl_io_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+@TestOn('!browser')
 library usage.usage_impl_io_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:test/test.dart';
 import 'package:usage/src/usage_impl_io.dart';
 
 main() => defineTests();
 
 void defineTests() {
   group('IOPostHandler', () {
-    test('sendPost', () {
+    test('sendPost', () async {
       var httpClient = new MockHttpClient();
       IOPostHandler postHandler = new IOPostHandler(mockClient: httpClient);
       Map<String, dynamic> args = {'utv': 'varName', 'utt': 123};
-      return postHandler.sendPost('http://www.google.com', args).then((_) {
-        expect(httpClient.sendCount, 1);
-      });
+      await postHandler.sendPost('http://www.google.com', args);
+      expect(httpClient.sendCount, 1);
     });
   });
 
   group('IOPersistentProperties', () {
     test('add', () {
       IOPersistentProperties props = new IOPersistentProperties('foo_props');
       props['foo'] = 'bar';
       expect(props['foo'], 'bar');
     });
 
     test('remove', () {
       IOPersistentProperties props = new IOPersistentProperties('foo_props');
       props['foo'] = 'bar';
       expect(props['foo'], 'bar');
       props['foo'] = null;
       expect(props['foo'], null);
     });
   });
+
+  group('usage_impl_io', () {
+    test('getDartVersion', () {
+      expect(getDartVersion(), isNotNull);
+    });
+
+    test('getPlatformLocale', () {
+      expect(getPlatformLocale(), isNotNull);
+    });
+  });
 }
 
 class MockHttpClient implements HttpClient {
+  @override
   String userAgent;
   int sendCount = 0;
   int writeCount = 0;
   bool closed = false;
+
+  @override
   Future<HttpClientRequest> postUrl(Uri url) {
     return new Future.value(new MockHttpClientRequest(this));
   }
-  noSuchMethod(Invocation invocation) { }
+
+  @override
+  noSuchMethod(Invocation invocation) {}
 }
 
 class MockHttpClientRequest implements HttpClientRequest {
   final MockHttpClient client;
+
   MockHttpClientRequest(this.client);
+
+  @override
   void write(Object obj) {
     client.writeCount++;
   }
+
+  @override
   Future<HttpClientResponse> close() {
     client.closed = true;
     return new Future.value(new MockHttpClientResponse(client));
   }
-  noSuchMethod(Invocation invocation) { }
+
+  @override
+  noSuchMethod(Invocation invocation) {}
 }
 
 class MockHttpClientResponse implements HttpClientResponse {
   final MockHttpClient client;
+
   MockHttpClientResponse(this.client);
-  Future drain([var futureValue]) {
+
+  @override
+  Future/*<E>*/ drain/*<E>*/([/*=E*/ futureValue]) {
     client.sendCount++;
     return new Future.value();
   }
-  noSuchMethod(Invocation invocation) { }
+
+  @override
+  noSuchMethod(Invocation invocation) {}
 }