Increase tablet message body font size to 16.

Fixes b/17468444.

Change-Id: I754152f7792ad35d21bf3b22bc54ad1a3b093957
diff --git a/res/values-sw600dp/constants.xml b/res/values-sw600dp/constants.xml
index fc29399..d1d9da0 100644
--- a/res/values-sw600dp/constants.xml
+++ b/res/values-sw600dp/constants.xml
@@ -25,4 +25,6 @@
 
     <!-- Whether or not we should scroll down so cc aligns with the top -->
     <bool name="auto_scroll_cc">false</bool>
+
+    <integer name="conversation_desired_font_size_px">16</integer>
 </resources>