Insert dynamic dashboard tiles into optional placeholders

Insteads of inserting tile onto screen using absolute priority values,
now each page can have a placeholder preference, and at run time we will
add dynamic dashboard tiles to placeholder's place.

Bug: 32827787
Test: RunSettingsRoboTests
Change-Id: I1fe9e11dce4eb6fb4a9b56af05a2b8e5cdae00d2

src/com/android/settings/SecuritySettings.java

@@ -781,8 +781,8 @@ public class SecuritySettings extends SettingsPreferenceFragment
         final List<Preference> preferences = new ArrayList<>();
         for (Tile tile : tiles) {
             final Preference pref = new Preference(getPrefContext());
-            mDashboardFeatureProvider
-                    .bindPreferenceToTile(getActivity(), pref, tile, null /* key */);
+            mDashboardFeatureProvider.bindPreferenceToTile(getActivity(), pref, tile,
+                    null /* key */, Preference.DEFAULT_ORDER/* baseOrder */);
             preferences.add(pref);
         }
         return preferences;