More fine-grained config for 'Search result preloading' setting.

Instead of a checkbox, it's now a setting always/wifi only/never.

Bug: 5086576
Change-Id: I265a22968eafee547571dc86c10c5d5421a305e8
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 123e5c8..77e25a3 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -646,8 +646,25 @@
     <string name="pref_data_title">Bandwidth Management</string>
     <!-- Title for search preloading [CHAR LIMIT=40] -->
     <string name="pref_data_preload_title">Search result preloading</string>
+    <!-- Search preloading options [CHAR LIMIT=20] -->
+    <string-array name="pref_data_preload_choices">
+        <item>Never</item>
+        <item>Only on Wi-Fi</item>
+        <item>Always</item>
+    </string-array>
+    <!-- Do not translate -->
+    <string name="pref_data_preload_value_never" translatable="false">NEVER</string>
+    <string name="pref_data_preload_value_wifi_only" translatable="false">WIFI_ONLY</string>
+    <string name="pref_data_preload_value_always" translatable="false">ALWAYS</string>
+    <string-array name="pref_data_preload_values" translatable="false">
+        <item><xliff:g>@string/pref_data_preload_value_never</xliff:g></item>
+        <item><xliff:g>@string/pref_data_preload_value_wifi_only</xliff:g></item>
+        <item><xliff:g>@string/pref_data_preload_value_always</xliff:g></item>
+    </string-array>
     <!-- Summary for search preloading [CHAR LIMIT=80] -->
     <string name="pref_data_preload_summary">Allow the browser to preload high confidence search results in the background</string>
+    <!-- Title of dialog for search preloading [CHAR LIMIT=40] -->
+    <string name="pref_data_preload_dialogtitle">Search result preloading</string>
     <!-- Title for a dialog displayed when the browser has a data connectivity
             problem -->
     <string name="browserFrameNetworkErrorLabel">Data connectivity problem</string>