Reloading workspace when the shortcuts permission changes

> Check for permission on every onResume
> If the permission is different than last known permission,
reload and rebind workspace.

Bug: 30789422
Change-Id: Idfa445815e29e2336505779545507d106b33a253

src/com/android/launcher3/Launcher.java

@@ -1090,6 +1090,9 @@ public class Launcher extends Activity
         if (!isWorkspaceLoading()) {
             // Process any items that were added while Launcher was away.
             InstallShortcutReceiver.disableAndFlushInstallQueue(this);
+
+            // Refresh shortcuts if the permission changed.
+            mModel.refreshShortcutsIfRequired();
         }
 
         if (shouldShowDiscoveryBounce()) {