Sometimes printer selection from all printers activity does not work.

1. Sometimes selecting a printer from the full printer list does not
   work if the selected printer was not in the initial drop down list
   of the print dialog.

   The reason was that there is a race. We use loaders in the print
   dialog activity and the all printers one. When these loaders are
   stopped we stop printer discovery since we do not want to keep this
   potentially expensive process on going if the activity is paused
   because say the user decide to press home and start playing his
   favorite game while the printers dialog is up. As a result the
   loader does not get printer updates until it is started.

   The loader of the print dialog activity is stopped while the user is
   selecting a printer from the all printers activity whose loader is
   getting discovered recent printers. Now when the user selects a printer
   the loader of the print dialog activity is started but may not get
   the latest printers by the time onActivityResult is called with the
   selected printer. Now we cache the selected printer id and if the
   loader reports it we select that printer.

2. In the print dialog we show only a few of the discovered printers.
   If the user selects a printer from the all printers activity that
   is not in the initial list we shuffle the adapter data to make sure
   the selected printer is in the shown subset. Now if the printers
   change, i.e. the printers loader reports new result we were not
   respecting the reshuffling made before so the short list of
   printers changes yet again.

bug:11034216

Change-Id: I54fe3619e3328b65839d9f4b02309699eae7f8eb