Put display options into a dialog-themed activity for xlarge screens

Change-Id: I2281661a162a60640a669f33c6bc37ac6f17b72e
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 4ffe15e..57f2c35 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -301,7 +301,10 @@
         </activity-alias>
 
         <!-- Used to select display and sync groups -->
-        <activity android:name=".ui.ContactsPreferencesActivity" android:label="@string/displayGroups" />
+        <activity
+            android:name=".ui.ContactsPreferencesActivity"
+            android:label="@string/displayGroups"
+            android:theme="@style/ContactsPreferencesTheme" />
 
         <activity
             android:name=".ui.ShowOrCreateActivity"
diff --git a/res/values-xlarge/styles.xml b/res/values-xlarge/styles.xml
index f514aad..3f773f9 100644
--- a/res/values-xlarge/styles.xml
+++ b/res/values-xlarge/styles.xml
@@ -19,5 +19,7 @@
     </style>
     <style name="ContactPickerTheme" parent="@android:Theme.Dialog">
     </style>
+    <style name="ContactsPreferencesTheme" parent="@android:Theme.Dialog">
+    </style>
 
 </resources>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 385cc53..f4f962c 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -111,4 +111,6 @@
     <style name="ContactPickerTheme" parent="@android:Theme">
     </style>
     
+    <style name="ContactsPreferencesTheme" parent="@android:Theme">
+    </style>
 </resources>