Add the border to the selected wallpaper.

Bug: 149716966
Change-Id: I99500fe11a87c2c93ae26d478fd9000d19a2c4d7
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index d65657c..524e21d 100755
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -210,4 +210,7 @@
     <dimen name="bottom_navbar_height">56dp</dimen>
     <dimen name="bottom_action_bar_padding_horizontal">16dp</dimen>
     <dimen name="bottom_action_bar_elevation">10dp</dimen>
+
+    <dimen name="option_border_width">2dp</dimen>
+    <dimen name="option_selected_border_width">3dp</dimen>
 </resources>