Implement the new UI design for the category tiles in the wallpaper
picker.

Screenshot: https://screenshot.googleplex.com/OZvuf2bx6bO.png
deck: https://docs.google.com/presentation/d/15JadcGi5k1_0znUN_XdFpU7UxeXwxjK3Y7LxvhW5ETM/edit#slide=id.g7c8f4a82bf_0_154

Bug: 149000013
Change-Id: I687c77eeb02d2df841fbb1b4630309d18da73b10
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 2966254..8bcbb3f 100755
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -22,10 +22,13 @@
 
     <!-- Dimensions for "category" tiles. -->
     <dimen name="grid_item_category_label_padding">12dp</dimen>
+    <dimen name="grid_item_category_label_padding_top">12dp</dimen>
+    <dimen name="grid_item_category_label_padding_bottom">4dp</dimen>
     <dimen name="grid_item_category_overlay_icon_margin_bottom">24dp</dimen>
     <dimen name="grid_item_category_title_height">48dp</dimen>
     <dimen name="grid_tile_aspect_height">340dp</dimen>
     <dimen name="grid_tile_aspect_width">182dp</dimen>
+    <dimen name="grid_edge_space">8dp</dimen>
 
     <!-- Dimensions for individual wallpaper tiles. -->
     <dimen name="grid_item_individual_wallpaper_selected_inset">14dp</dimen>