Clean up search fragment loader lifecycle.

- Programatically create SearchView to make it always expand across
  entire action bar.
- Store current query text during screen rotation
- Restart loader when query text changes

Bug: 33354491
Test: RunSettingsRoboTests
Change-Id: I63838a38514569aac60c5d67ac52ac06a7acd5a3

src/com/android/settings/search2/SearchFeatureProviderImpl.java

@@ -24,6 +24,9 @@ import android.view.Menu;
 
 import android.view.MenuItem;
 import com.android.settings.R;
+import com.android.settings.utils.AsyncLoader;
+
+import java.util.List;
 
 /**
  * FeatureProvider for the refactored search code.
@@ -60,4 +63,9 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
 
         menuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
     }
+
+    @Override
+    public DatabaseResultLoader getDatabaseSearchLoader(Context context, String query) {
+        return new DatabaseResultLoader(context, query);
+    }
 }