Add Settings overlay for theme picker.

Makes theme picker appear under display settings.

Change-Id: Ibd02eacf1c199979123e54054715b72d91af3851

overlay/common/packages/apps/Settings/res/values/config.xml

@@ -26,4 +26,10 @@
 
     <!-- Whether wallpaper attribution should be shown or not. -->
     <bool name="config_show_wallpaper_attribution">false</bool>
+
+    <!-- Package name and fully-qualified class name for the wallpaper picker activity. -->
+    <string name="config_wallpaper_picker_package" translatable="false">com.android.wallpaper</string>
+    <string name="config_wallpaper_picker_class" translatable="false">com.android.customization.picker.CustomizationPickerActivity</string>
+    <!-- Fully-qualified class name for the styles & wallpaper picker activity. -->
+    <string name="config_styles_and_wallpaper_picker_class" translatable="false">com.android.customization.picker.CustomizationPickerActivity</string>
 </resources>