Make auto-fill UI robust

Now the autofill UI tracks the movement of the anchor view,
both real and virtual and while still preventing the filled
app from accessing the chooser UI. This was achieved by using
a popup window in the app process to determine the window
location and adding a window presenter interface to popup
window that controls the actual window addition, removal, and
update which is implemented by the system server.

Test: all autofill CTS tests pass

bug: 36392498
bug: 35708258
bug: 34943932
fixes: 36039182
fixes: 36493078

Change-Id: I0321913b2e2e759f4b17003bf85cb873e63a467c