Make classes that extend ItemInfo public.

Also follow up on changes in ag/418520, adding Views to those method
params.

Change-Id: I93e0a3b30d10b969d1903a2f227f6744d709e89a

src/com/android/launcher3/ShortcutInfo.java

@@ -31,7 +31,7 @@ import java.util.ArrayList;
 /**
  * Represents a launchable icon on the workspaces and in folders.
  */
-class ShortcutInfo extends ItemInfo {
+public class ShortcutInfo extends ItemInfo {
 
     /**
      * The intent used to start the application.