Show unavailable printers disabled and grayed out.

1. If a printer is not available it has to disabled and grayed out.

2. Cancle a print job if the app does not provide the requested pages.

3. Fix current printer selection flicker when the print dialog is
   showing up. Often the current printer is initially set to the user's
   favorite and then it is changed back to the PDF one.

bug:10983508

Change-Id: I8d53eb992cf1c92675ec09f61b2ec272b962fa68