Merge "Add ripple to navigation bar button"

        android:layout_height="match_parent"

        android:layout_width="wrap_content"

        android:orientation="horizontal"

        android:gravity="center">

        android:background="?android:attr/selectableItemBackground">

    <com.android.keyguard.AlphaOptimizedImageButton

            android:id="@+id/car_nav_button_icon"

            android:layout_height="match_parent"