BTW, did you mean to label the components Internals>Printing and Internals>Skia, rather than "InternalsPrinting" and "InternalsSkia" ?

thx

TODO:

1) We need to figure out how to integrate SkXPS into Chrome.  We can compile it and change MakePDF to MakeXPS, but it fails due to permissions in the sandboxed printing process.  bungeman@ I looked at this a few months ago, but have not gotten back to it.

2) Add a PrintPagesToXPS() javascript function we could use for testing.

3) Find/develop a tool to rasterize a XPS document for testing.

4) Add a Save-as-XPS option in the Windows/Chrome print dialog.

5) Find out how to send a XPS document to a printer in Windows.

6) Test, Test, debug, test, debug, test.

7) Put it all together and bypass pdf+pdfium for prtinting.

> 5) Find out how to send a XPS document to a printer in Windows.

Assuming Windows XP is no longer supported, the XPS Print API looks like the likely candidate:

https://msdn.microsoft.com/en-us/library/windows/desktop/ff728890(v=vs.85).aspx

Note the entry page to the docs for that API:

https://msdn.microsoft.com/en-us/library/windows/desktop/ff686814(v=vs.85).aspx

now says:

"The XPS Print API is not supported and may be altered or unavailable in the future. Client applications should use the Print Document Package API instead."

The Print Document Package API is only supported as of Windows 8 though.

The following revision refers to this bug:
  https://skia.googlesource.com/skia.git/+/a634b742320ae1c14ddb296e45569947daced9fc

commit a634b742320ae1c14ddb296e45569947daced9fc
Author: halcanary <halcanary@google.com>
Date: Thu Oct 13 15:44:11 2016

SkXPS: compile under clang on win

BUG= chromium:616763 
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2408133006

Review-Url: https://codereview.chromium.org/2408133006

[modify] https://crrev.com/a634b742320ae1c14ddb296e45569947daced9fc/src/xps/SkXPSDevice.cpp
[modify] https://crrev.com/a634b742320ae1c14ddb296e45569947daced9fc/src/xps/SkXPSDevice.h

The following revision refers to this bug:
  https://skia.googlesource.com/skia.git/+/a634b742320ae1c14ddb296e45569947daced9fc

commit a634b742320ae1c14ddb296e45569947daced9fc
Author: halcanary <halcanary@google.com>
Date: Thu Oct 13 15:44:11 2016

SkXPS: compile under clang on win

BUG= chromium:616763 
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2408133006

Review-Url: https://codereview.chromium.org/2408133006

[modify] https://crrev.com/a634b742320ae1c14ddb296e45569947daced9fc/src/xps/SkXPSDevice.cpp
[modify] https://crrev.com/a634b742320ae1c14ddb296e45569947daced9fc/src/xps/SkXPSDevice.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/64c8b8a56326e9b6aa1cd08bd79b22d3862bf10a

commit 64c8b8a56326e9b6aa1cd08bd79b22d3862bf10a
Author: skia-deps-roller <skia-deps-roller@chromium.org>
Date: Thu Oct 13 17:50:20 2016

Roll src/third_party/skia/ 1eab44260..a634b7423 (1 commit).

https://chromium.googlesource.com/skia.git/+log/1eab44260211..a634b742320a

$ git log 1eab44260..a634b7423 --date=short --no-merges --format='%ad %ae %s'
2016-10-13 halcanary SkXPS: compile under clang on win

BUG= 616763 

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=jvanverth@google.com

Review-Url: https://codereview.chromium.org/2414083002
Cr-Commit-Position: refs/heads/master@{#425080}

[modify] https://crrev.com/64c8b8a56326e9b6aa1cd08bd79b22d3862bf10a/DEPS

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f35e994096cf339e54acd9b6883b6d3cf1e5b846

commit f35e994096cf339e54acd9b6883b6d3cf1e5b846
Author: halcanary <halcanary@google.com>
Date: Thu Nov 03 19:08:42 2016

chrome.gpuBenchmarking.printPagesToXPS

BUG= chromium:616763 

Review-Url: https://codereview.chromium.org/2413753003
Cr-Commit-Position: refs/heads/master@{#429662}

[modify] https://crrev.com/f35e994096cf339e54acd9b6883b6d3cf1e5b846/content/renderer/gpu/gpu_benchmarking_extension.cc
[modify] https://crrev.com/f35e994096cf339e54acd9b6883b6d3cf1e5b846/content/renderer/gpu/gpu_benchmarking_extension.h
[modify] https://crrev.com/f35e994096cf339e54acd9b6883b6d3cf1e5b846/skia/BUILD.gn

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/05683872522a0e03b9de2243a1f4f30a5e6d3dca

commit 05683872522a0e03b9de2243a1f4f30a5e6d3dca
Author: halcanary <halcanary@google.com>
Date: Wed Jan 04 16:45:14 2017

Implement SkEncodeImage()

This change replaces the implementation in SkImageEncoder_none.cpp with
an implementation that allows the layer above to define an image
encoding function.

Background:  Skia's (experimental) XPS backend needs a PNG encoder.
Skia for Chromium does not compile its PNG encoder, but there is one
available in Chrome's gfx component.  To make layering work right,
I allow the layer above skia (gfx) to define an encoding function
that can be installed into skia.

TODO: initialize the function pointer in printing process.

Also: Revert "SK_SUPPORT_LEGACY_IMAGE_ENCODER_CLASS"
This reverts commit 1430e85be96647271e370c92c4940244dc149e76.

BUG= chromium:616763 

Review-Url: https://codereview.chromium.org/2527833002
Cr-Commit-Position: refs/heads/master@{#441395}

[modify] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/skia/BUILD.gn
[modify] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/skia/config/SkUserConfig.h
[add] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/skia/ext/skia_encode_image.cc
[add] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/skia/ext/skia_encode_image.h
[modify] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/ui/gfx/BUILD.gn
[add] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/ui/gfx/codec/skia_image_encoder_adapter.cc
[add] https://crrev.com/05683872522a0e03b9de2243a1f4f30a5e6d3dca/ui/gfx/codec/skia_image_encoder_adapter.h

It does not sound like anyone in Chrome wants this feature anymore.