Merge "Zen: Add content description to settings icon." into lmp-dev

            android:layout_alignParentEnd="true"

            android:background="@drawable/btn_borderless_rect"

            android:clickable="true"

            android:contentDescription="@null"

            android:contentDescription="@string/accessibility_desc_settings"

            android:scaleType="center"

            android:src="@drawable/ic_settings" />