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

tests/robotests/src/com/android/settings/search/SearchFeatureProviderImplTest.java

@@ -19,17 +19,13 @@ package com.android.settings.search;
 
 import android.app.Activity;
 import android.content.Context;
-import android.content.res.Configuration;
 import android.view.Menu;
 
 import com.android.settings.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
-import com.android.settings.overlay.FeatureFactory;
-import com.android.settings.search2.DatabaseIndexingManager;
+import com.android.settings.dashboard.SiteMapManager;
 import com.android.settings.search2.SearchFeatureProviderImpl;
 
-import com.android.settings.testutils.FakeFeatureFactory;
-import com.android.settingslib.drawer.DashboardCategory;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -76,6 +72,14 @@ public class SearchFeatureProviderImplTest {
         verify(menu).add(anyInt(), anyInt(), anyInt(), anyString());
     }
 
+    @Test
+    public void getSiteMapManager_shouldCacheInstanec() {
+        final SiteMapManager manager1 = mProvider.getSiteMapManager();
+        final SiteMapManager manager2 = mProvider.getSiteMapManager();
+
+        assertThat(manager1).isSameAs(manager2);
+    }
+
     @Test
     public void testUpdateIndexNewSearch_UsesDatabaseIndexingManager() {
         mProvider = spy(new SearchFeatureProviderImpl());