title: Create Sign-in-with-Google button in Flutter in accordance with the terms
body: <p>I'd like to add a "Sign in with Google" Button to my Flutter app. This button should be in accordance with the <a href="https://developers.google.com/identity/branding-guidelines" rel="noreferrer">terms</a> of Google.</p>
  
  <p>My problem is, that the button I've create looks really awful.</p>
  
  <p>I used the images which Google provides on their website but I don't know if I'm doing right with the code for the button.</p>
  
  <pre><code>  Widget _createLoginButtonGoogle() {
      return new Expanded(
        child: new Container(
          margin: EdgeInsets.fromLTRB(30.0, 5.0, 30.0, 5.0),
          child: new RaisedButton(
            color: const Color(0xFF4285F4),
            shape: _createButtonBorder(),
            onPressed: () {},
            child: new Row(
              children: &lt;Widget&gt;[
                new Image.asset(
                  'res/images/icons/google/btn_google_dark_normal_mdpi.9.png',
                  height: 48.0,
                ),
                new Expanded(
                  child: _createButtonText('Sign in with Google', Colors.white),
                ),
              ],
            ),
          ),
        ),
      );
    }
  </code></pre>
  
  <p>What I want is that my button looks like the original Google button</p>
  
  <p><a href="https://i.stack.imgur.com/qpM2J.png" rel="noreferrer"><img src="https://i.stack.imgur.com/qpM2J.png" alt="original google button"></a></p>
  
  <p>And not like my version</p>
  
  <p><a href="https://i.stack.imgur.com/RMHpv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/RMHpv.png" alt="my version of the google button"></a></p>
  
  <p>Can anyone tell me how to create the original google button? Is there a better way than creating a <code>RaisedButton</code>?</p>