Move ad-hoc dynamic tile injection into FeatureProvider.

Ideally a page should use DashboardFragment and it doesn't need to
handle adding dynamic tiles manually. This method is only designed for
page that are not fully migrated to DashboardFragment yet.

Bug: 32623105
Test: RunSettingsRoboTests
Change-Id: I0cafcddf9a43b164daea500bade869fada5b3f4e

src/com/android/settings/dashboard/DashboardFeatureProvider.java

@@ -39,6 +39,19 @@ public interface DashboardFeatureProvider {
      */
     DashboardCategory getTilesForCategory(String key);
 
+    /**
+     * Get tiles (wrapped as a list of Preference) for key defined in CategoryKey.
+     *
+     * @param activity Activity hosting the preference
+     * @param context UI context to inflate preference
+     * @param key Value from CategoryKey
+     * @deprecated Pages implementing {@code DashboardFragment} should use
+     * {@link #getTilesForCategory(String)} instead. Using this method will not get the benefit
+     * of auto-ordering, progressive disclosure, auto-refreshing summary text etc.
+     */
+    @Deprecated
+    List<Preference> getPreferencesForCategory(Activity activity, Context context, String key);
+
     /**
      * Get all tiles, grouped by category.
      */
@@ -75,4 +88,5 @@ public interface DashboardFeatureProvider {
     ProgressiveDisclosureMixin getProgressiveDisclosureMixin(Context context,
             DashboardFragment fragment);
 
+
 }