Fix a few auto fill ussues

1. Ensure clicking on a focused view brings up autofill if needed

2. Notify the autofill manager in a couple of cases we missed

3. Renamed the AutofillManager app facing APIs to better reflect what
    they do and added a API for the app to cancel the autofill interaction

4. Fix view structure dispatch where the ordering of children for autofill
    was mixed with ordering of direct view children - the autofill children
    may be indirect as views can be marked not important for autofill

5. Show scrollbars only if there are more fill options than want is shown

6. Show only three fill options and the rest can be accessed with a scroll

7. Remove the list divider to allow fill items to control all fill window content

8. Renamed the autofill manager internal service classes to xxAutofillxx

9. Fixed a comment that was not addressed in a previous CL

10. Showing max three fill options - rest needs a scroll

11. Make sure fill UI shown when filter with no matches is changed
      to filter with some matches

12. Make sure the fill window has a shadow

Test: Autofill CTS tests pass and manual

bug:36038929
bug:36040101
bug:36149166
bug:36034681
bug:36126001
bug:36035654

Change-Id: Ic8726146fc3c0a19d3e536becdd63fb65622136e