title: app:passwordToggleEnabled="true" not working
body: <p>I am trying to implement a login page and this is my <code>TextInputLayout</code> for the password field.</p>
  
  <pre><code>&lt;android.support.design.widget.TextInputLayout
          android:id="@+id/password"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_marginLeft="15dp"
          android:layout_marginRight="15dp"
          android:hint="Password"
          app:passwordToggleDrawable="@drawable/eye_outline"
          android:theme="@style/GFSTextInputLayoutTheme"
          app:passwordToggleEnabled="true"&gt;
  
          &lt;EditText
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:inputType="textPassword"
              android:textColor="@color/black"
              android:textColorHint="@color/light_grey"
              android:textSize="20dp" /&gt;
  
      &lt;/android.support.design.widget.TextInputLayout&gt;
  </code></pre>
  
  <p>But somehow the <code>app:passwordToggleEnabled="true"</code> doesn't seem to work.</p>
  
  <p><a href="https://i.stack.imgur.com/FMLWj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FMLWj.png" alt="enter image description here"></a></p>
  
  <p>Here are my gradle imports:</p>
  
  <pre><code>compile 'com.android.support:design:27.1.1'
  compile 'com.android.support:support-v4:27.1.1'
  compile 'com.android.support:appcompat-v7:27.1.1'
  compile 'com.android.support:recyclerview-v7:27.1.1'
  compile 'com.android.support:support-vector-drawable:27.1.1'
  compile 'com.android.support.constraint:constraint-layout:1.1.0'
  compile 'com.android.support:recyclerview-v7:27.1.1'
  compile 'com.android.support:cardview-v7:27.1.1'
  </code></pre>
  
  <p>Edit:</p>
  
  <p>styles.xml</p>
  
  <pre><code>&lt;style name="GFSTextInputLayoutTheme" parent="TextAppearance.AppCompat"&gt;
      &lt;!-- Hint color and label color in FALSE state --&gt;
      &lt;item name="android:textColorHint"&gt;@color/light_grey&lt;/item&gt;
      &lt;!-- Label color in TRUE state and bar color FALSE and TRUE State --&gt;
      &lt;item name="colorAccent"&gt;@color/light_grey&lt;/item&gt;
      &lt;item name="colorControlNormal"&gt;@color/light_grey&lt;/item&gt;
      &lt;item name="colorControlActivated"&gt;@color/gfs_blue&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>Any idea why this isn't working?</p>