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This is to support moving print driver interactions to the operating
system outside of the browser process.  This improves stability so that
crashes related to misbehavior with third party drivers can be contained
in a utility process instead of taking down the browser.

Start off the interface with the query to get the current default
printer.  This is a common initial first query when starting the
printing sequence.

Bug: 809738
Change-Id: I819ecf71c889494f2aa05cf150359e68f799553c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422820Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822209}