Build slice from indexed data in SliceProvider

Connect the SliceIndexing data to the SliceProvider,
such that a query to SliceProvider can build a Slice
via the indexed data from SlicesIndexingManager.

We take the key from the Uri supplied to the SettingSliceProvider
and find a potential matching row in the indexed data. The
matched data is then used to Build a slice for the caller.

Bug: 67996923
Test: robotests
Change-Id: If51bfd1a05c3f3817ae720554f95a98fc7b002e1

src/com/android/settings/slices/SlicesDatabaseHelper.java

@@ -104,7 +104,7 @@ public class SlicesDatabaseHelper extends SQLiteOpenHelper {
 
     public static synchronized SlicesDatabaseHelper getInstance(Context context) {
         if (sSingleton == null) {
-            sSingleton = new SlicesDatabaseHelper(context);
+            sSingleton = new SlicesDatabaseHelper(context.getApplicationContext());
         }
         return sSingleton;
     }