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/SearchFeatureProviderImpl.java

@@ -25,6 +25,7 @@ import android.view.MenuItem;
 
 import com.android.settings.R;
 import com.android.settings.applications.PackageManagerWrapperImpl;
+import com.android.settings.dashboard.SiteMapManager;
 import com.android.settings.search.Index;
 
 /**
@@ -35,6 +36,7 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
     private static final String TAG = "SearchFeatureProvider";
 
     private DatabaseIndexingManager mDatabaseIndexingManager;
+    private SiteMapManager mSiteMapManager;
 
     @Override
     public boolean isEnabled(Context context) {
@@ -86,6 +88,13 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
         return mDatabaseIndexingManager;
     }
 
+    public SiteMapManager getSiteMapManager() {
+        if (mSiteMapManager == null) {
+            mSiteMapManager = new SiteMapManager();
+        }
+        return mSiteMapManager;
+    }
+
     @Override
     public void updateIndex(Context context) {
         long indexStartTime = System.currentTimeMillis();