Fix Autofill for specific autofocus apps.

1. On autofocus apps, AssistStructure is requested on view load
2. On specific apps, it will autofocus away from the first autofocus field, so it Session sets mCurrentViewId = null;
3. When AssistStructure is generated, it checks for currentViewId == null. If true, returns earlys - no further Autofill actions can be done for the current view.

This change checks if there is an AssistStructure currently processing before setting mCurrentViewId to prevent the above race condition.



Fixes: 271294796
Test: On physical apps that are impacted

Change-Id: I325a88c907db2887ee5565241f74b0b511dc6915