Improve Hybird hotseat cache support

Loads list of cached apps and shows predicted app icons with the rest of workspace items.

-> Extracted prediction caching logic into a model layer

Bug: 155029837
Test: Manual

Change-Id: I6981594a910f5fe4e8e8cf8fe39db0cb856e7acd

src/com/android/launcher3/model/BgDataModel.java

@@ -92,6 +92,11 @@ public class BgDataModel {
      */
     public final Map<ShortcutKey, MutableInt> pinnedShortcutCounts = new HashMap<>();
 
+    /**
+     * List of all cached predicted items visible on home screen
+     */
+    public final ArrayList<AppInfo> cachedPredictedItems = new ArrayList<>();
+
     /**
      * True if the launcher has permission to access deep shortcuts.
      */
@@ -366,5 +371,10 @@ public class BgDataModel {
         void bindDeepShortcutMap(HashMap<ComponentKey, Integer> deepShortcutMap);
 
         void bindAllApplications(AppInfo[] apps);
+
+        /**
+         * Binds predicted appInfos at at available prediction slots.
+         */
+        void bindPredictedItems(List<AppInfo> appInfos, IntArray ranks);
     }
 }