Merge "Update SliceViewStyle background color" into qt-dev

        <androidx.slice.widget.SliceView

            android:id="@+id/slice_view"

            style="@style/SliceViewStyle"

            style="@style/ContextualCardSliceViewStyle"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

        <item name="android:paddingEnd">8dp</item>

        <item name="rowStyle">@style/SliceRowStyle</item>

        <item name="android:background">?android:attr/colorBackgroundFloating</item>

    </style>

    <style name="ContextualCardSliceViewStyle" parent="SliceViewStyle">

        <item name="android:background">@color/contextual_card_background</item>

    </style>