Misc logging changes

- log search result count, rank when clicking search result.
- log app package when default app is changed

Change-Id: Idd11bd67caba2beaa59c65839c40db8c71787388
Fix: 62072727
Test: make RunSettingsRoboTests

tests/robotests/src/com/android/settings/testutils/DatabaseTestUtils.java

@@ -16,13 +16,18 @@
 
 package com.android.settings.testutils;
 
+import android.content.Context;
+
 import com.android.settings.search.IndexDatabaseHelper;
 
 import java.lang.reflect.Field;
 
 public class DatabaseTestUtils {
 
-    public static void clearDb() {
+    public static void clearDb(Context context) {
+        IndexDatabaseHelper helper = IndexDatabaseHelper.getInstance(context);
+        helper.close();
+
         Field instance;
         Class clazz = IndexDatabaseHelper.class;
         try {