Enlarge the selection area

Extend the area of the icon touch target in all directions for
selecting items more easily.

Change-Id: I143967c784ed30dd9a35a59aeeecf6bf05c4cf63
Fix: 79839048
Test: atest DocumentsUITests
Test: manual
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 3e7cf78..122b669 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -31,8 +31,10 @@
     <dimen name="grid_item_margin">6dp</dimen>
     <dimen name="grid_padding_horiz">4dp</dimen>
     <dimen name="grid_padding_vert">4dp</dimen>
+    <dimen name="list_item_width">72dp</dimen>
     <dimen name="list_item_height">72dp</dimen>
     <dimen name="list_item_padding">16dp</dimen>
+    <dimen name="list_item_icon_padding">16dp</dimen>
     <dimen name="breadcrumb_item_padding">8dp</dimen>
     <dimen name="breadcrumb_item_height">36dp</dimen>
     <dimen name="list_divider_inset">72dp</dimen>