New preference for selecting new voice interaction service.

This is currently in addition to the existing Voice Search
preference in this UI.  Eventually it will replace that one,
as a superset of its functionality.

Change-Id: I26f1220fa129870cad3ec4152a569a9c494971fb
diff --git a/res/xml/language_settings.xml b/res/xml/language_settings.xml
index 3e7fdb5..c210312 100644
--- a/res/xml/language_settings.xml
+++ b/res/xml/language_settings.xml
@@ -73,6 +73,16 @@
 
         <!-- entries, entryValues, and defaultValue will be populated programmatically. -->
         <ListPreference
+                android:key="voice_interactor"
+                android:title="@string/voice_interactor_title"
+                android:dialogTitle="@string/voice_interactor_title" />
+
+        <!-- An intent for this preference will be populated programmatically. -->
+        <PreferenceScreen android:key="voice_interactor_settings"
+                android:title="@string/voice_interactor_settings_title" />
+
+        <!-- entries, entryValues, and defaultValue will be populated programmatically. -->
+        <ListPreference
                 android:key="recognizer"
                 android:title="@string/recognizer_title"
                 android:dialogTitle="@string/recognizer_title" />