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/XmlParserUtils.java

@@ -24,9 +24,6 @@ import android.util.TypedValue;
 
 import com.android.settings.R;
 
-import java.text.Normalizer;
-import java.util.regex.Pattern;
-
 /**
  * Utility class to parse elements of XML preferences
  */
@@ -74,6 +71,14 @@ public class XmlParserUtils {
         return getData(context, attrs, R.styleable.Preference, R.styleable.Preference_keywords);
     }
 
+    /**
+     * Returns the fragment name if this preference launches a child fragment.
+     */
+    public static String getDataChildFragment(Context context, AttributeSet attrs) {
+        return getData(context, attrs, R.styleable.Preference,
+                R.styleable.Preference_android_fragment);
+    }
+
     private static String getData(Context context, AttributeSet set, int[] attrs, int resId) {
         final TypedArray sa = context.obtainStyledAttributes(set, attrs);
         final TypedValue tv = sa.peekValue(resId);