title: Custom theme not working properly. [Flutter]
body: <p>I have created the following theme for my app:</p>
  
  <pre><code>ThemeData _buildDarkTheme() {
    final baseTheme = ThemeData(fontFamily: "Sunflower",);
    return baseTheme.copyWith(
        brightness: Brightness.dark,
        primaryColor: Colors.grey[800],
        accentColor: Colors.grey[850]);
  }
  </code></pre>
  
  <p>I then apply it to my app as follows:</p>
  
  <pre><code>class MyApp extends StatelessWidget {
    MyApp({Key key}) : super(key: key);
    @override
    Widget build(BuildContext context) {
      return new MaterialApp(
          theme: _buildDarkTheme(),
          home: new Scaffold(
            appBar: _buildAppBar(),
            body: new Container(
              color: Theme.of(context).accentColor,
              height: double.infinity,
              child: new ListView.builder(...
  </code></pre>
  
  <p>However, when I try to access the accent color inside the container (or anywhere else) instead of it being the expected, Colors.grey[850], it instead defaults to blue. Also, trying to use the custom font Sunflower font family does not work, but when I instead use</p>
  
  <pre><code>new Text("Hello World", style: new TextStyle(fontFamily: "Sunflower"))
  </code></pre>
  
  <p>The font appears correctly.</p>
  
  <p>I am new to flutter and dart so any help resolving these issues would be appreciated.</p>