title: layout_anchor and layout_anchorGravity do not work as expected
body: <p>Does anyone know if this screenshot </p>
  
  <p><a href="https://i.stack.imgur.com/KRd0w.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KRd0w.png" alt="enter image description here"></a></p>
  
  <p>reflects this layout correctly?</p>
  
  <pre><code>    &lt;android.support.design.widget.CoordinatorLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
      &lt;TextView
          android:id="@+id/text_view1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:background="#FFFFFF80"
          style="@android:style/TextAppearance.DeviceDefault.Large"
          android:text="@string/text_1"/&gt;
      &lt;TextView
          android:id="@+id/text_view2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:gravity="center"
          app:layout_anchor="@id/text_view1"
          app:layout_anchorGravity="bottom|right"
          android:background="#FFFF8080"
          style="@android:style/TextAppearance.DeviceDefault.Large"
          android:text="@string/text_2"/&gt;
      &lt;TextView
          android:id="@+id/text_view3"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:gravity="center"
          app:layout_anchor="@id/text_view2"
          app:layout_anchorGravity="bottom|right"
          android:background="#FF8080FF"
          style="@android:style/TextAppearance.DeviceDefault.Large"
          android:text="@string/text_3"/&gt;
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>I was not expecting any overlap of text views, but may be my expectations are not correct?</p>