Build a sitemap manager to keep track of breadcrumbs

- Have a new db to track parent-child page relation at index time.
- Make a registry class to track (in IA) which page host what type of
  sub pages.
- Make a manager class that queries the db as well as IA to compute
  breadcrumbs

Fix: 32936784
Test: RunSettingsRoboTest

Change-Id: I5f1583fae772c3d477d2ad186e111b79cc3e41aa

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

@@ -19,6 +19,8 @@ import android.app.Activity;
 import android.content.Context;
 import android.view.Menu;
 
+import com.android.settings.dashboard.SiteMapManager;
+
 /**
  * FeatureProvider for Settings Search
  */
@@ -57,6 +59,11 @@ public interface SearchFeatureProvider {
      */
     DatabaseIndexingManager getIndexingManager(Context context);
 
+    /**
+     * Returns the manager for looking up breadcrumbs.
+     */
+    SiteMapManager getSiteMapManager();
+
     /**
      * Updates the Settings indexes
      */