Using WidgetCell in the Pin Item confirmation prompt for a consistent UI

Also fixing some platform API changes in PinItemRequestCompat

Bug: 33584624
Change-Id: I255829f0079f1a3967bf8d6a337da12c890eb7ec

src/com/android/launcher3/compat/ShortcutConfigActivityInfo.java

@@ -50,7 +50,7 @@ public abstract class ShortcutConfigActivityInfo {
     private final ComponentName mCn;
     private final UserHandle mUser;
 
-    private ShortcutConfigActivityInfo(ComponentName cn, UserHandle user) {
+    protected ShortcutConfigActivityInfo(ComponentName cn, UserHandle user) {
         mCn = cn;
         mUser = user;
     }
@@ -84,6 +84,14 @@ public abstract class ShortcutConfigActivityInfo {
         return false;
     }
 
+    /**
+     * Returns true if various properties ({@link #getLabel()}, {@link #getFullResIcon}) can
+     * be safely persisted.
+     */
+    public boolean isPersistable() {
+        return true;
+    }
+
     static class ShortcutConfigActivityInfoVL extends ShortcutConfigActivityInfo {
 
         private final ActivityInfo mInfo;