Default WiFi sleep policy setting

Creates a defult.xml setting for WiFi sleep policy.

It is now possible, through device overlays, to change
the default sleep policy to e.g. never in order to improve
user experience of WiFi.

Change-Id: Ie459b8e70fdbc7c605452fe0692d7bc26460e939

Author: Erik Ljungberg

packages/SettingsProvider/res/values/defaults.xml

@@ -46,6 +46,8 @@
     <bool name="def_netstats_enabled">true</bool>
     <bool name="def_usb_mass_storage_enabled">true</bool>
     <bool name="def_wifi_on">false</bool>
+    <!-- 0 == default, 1 == never while plugged, 2 == never -->
+    <integer name="def_wifi_sleep_policy">0</integer>
     <bool name="def_networks_available_notification_on">true</bool>
 
     <bool name="def_backup_enabled">false</bool>

packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java

@@ -1496,6 +1496,8 @@ private void loadSystemSettings(SQLiteDatabase db) {
             loadIntegerSetting(stmt, Settings.System.POINTER_SPEED,
                     R.integer.def_pointer_speed);
 
+            loadIntegerSetting(stmt, Settings.System.WIFI_SLEEP_POLICY,
+                    R.integer.def_wifi_sleep_policy);
         } finally {
             if (stmt != null) stmt.close();
         }