Symmetric ripples in ContactTileAdapter

This CL keep the amount of whitespace around the images constant.
It increases the margin around the images (previously 0) and decreases
the padding.

Bug: 17394103
Change-Id: Ib1429adf602e39fbdaeb8a56804358225b4b102d
diff --git a/res-common/values/dimens.xml b/res-common/values/dimens.xml
index 3d48fa2..57bcdfd 100644
--- a/res-common/values/dimens.xml
+++ b/res-common/values/dimens.xml
@@ -30,8 +30,8 @@
 
     <!--  Horizontal padding in between contact tiles -->
     <dimen name="contact_tile_divider_padding">23dip</dimen>
-    <!--  Horizontal padding before the first tile and after the last tile -->
-    <dimen name="contact_tile_start_end_padding">16dip</dimen>
+    <!--  Horizontal whitespace (both padding and margin) before the first tile and after the last tile -->
+    <dimen name="contact_tile_start_end_whitespace">16dip</dimen>
 
     <!-- Left and right padding for a contact detail item -->
     <dimen name="detail_item_side_margin">16dip</dimen>