Merge "Use RelativeLayout for the backing view" into lmp-dev

    android:gravity="bottom|center_horizontal"

    android:orientation="vertical" >

    <!-- The height of key_preview_backing view will automatically be determined by code. -->

    <View

    <RelativeLayout

        android:id="@+id/key_preview_backing"

        android:layout_width="match_parent"

        android:layout_height="0dp" />