Set colorBackgroundFloating in ThemeOverlays

BUG: 31077818
Change-Id: I7b35823cc50569aaa708f1cb015de02863d80f1c
diff --git a/v7/appcompat/res/values/themes_base.xml b/v7/appcompat/res/values/themes_base.xml
index d16ab89..117ee03 100644
--- a/v7/appcompat/res/values/themes_base.xml
+++ b/v7/appcompat/res/values/themes_base.xml
@@ -584,6 +584,7 @@
         <item name="android:colorForegroundInverse">@color/foreground_material_dark</item>
         <item name="android:colorBackground">@color/background_material_light</item>
         <item name="android:colorBackgroundCacheHint">@color/abc_background_cache_hint_selector_material_light</item>
+        <item name="colorBackgroundFloating">@color/background_floating_material_light</item>
 
         <item name="android:textColorPrimary">@color/abc_primary_text_material_light</item>
         <item name="android:textColorPrimaryInverse">@color/abc_primary_text_material_dark</item>
@@ -612,6 +613,7 @@
         <item name="android:colorForegroundInverse">@color/foreground_material_light</item>
         <item name="android:colorBackground">@color/background_material_dark</item>
         <item name="android:colorBackgroundCacheHint">@color/abc_background_cache_hint_selector_material_dark</item>
+        <item name="colorBackgroundFloating">@color/background_floating_material_dark</item>
 
         <item name="android:textColorPrimary">@color/abc_primary_text_material_dark</item>
         <item name="android:textColorPrimaryInverse">@color/abc_primary_text_material_light</item>