A later CL will move all document-level fields and methods into
SkXPSDocument.
* SkXPSDocument cnstructor requires a xps factory ptr.
* All device layers share ownership of a single factory.
* renames SkDocument_XPS to the easier-to-say SkXPSDocument.
* Moves autocoinitialize to DM.
TODO: pipe the IXpsOMObjectFactory* into the SkDocument api.
No change in rendered documents.
Change-Id: I8a4680a3603951b1ce5f6c1de48714d4902061a9
Reviewed-on: https://skia-review.googlesource.com/7998
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
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