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The legacy Windows printing with GDI/EMF has a different print path
from other desktop platforms, as it spools each page of a document
separately so that the results can go through an extra conversion step
from PDF to EMF before being sent to a device.

With XPS printing path no extra conversion step is required, enabling
Windows to use a similar interface as for other desktop platforms and
get the document metafile and simply spool the job.  This CL enables
that option for XPS to coexist with GDI depending upon the
|kUseXpsForPrinting| feature flag.

This CL uses a NOTIMPLEMENTED in PrintingContextWin::PrintDocument()
as a placeholder for where Skia calls will occur, which is to come in
later CL.

Bug: 1008222
Change-Id: I7d6b0a1ef737eaba358f99ed04e047d24a0e895e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935946Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723446}