Add a color for settings button.

Bug: 17446974
Change-Id: Id0bff47083adca33d457acfd671d4e614be24167
diff --git a/res/values/colors.xml b/res/values/colors.xml
index 863bfe9..6e44f8b 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -27,6 +27,7 @@
     <!-- Color for the setting description text. -->
     <color name="setting_secondary_color">@color/dialtacts_secondary_text_color</color>
     <color name="setting_background_color">#ffffff</color>
+    <color name="setting_button_color">#eee</color>
 
     <!-- Color of the text describing an unconsumed missed call. -->
     <color name="call_log_missed_call_highlight_color">@color/dialer_red_highlight_color</color>