printing: Move printing::DuplexMode to //printing/mojom/print.mojom

This CL introduces printing/mojom/print.mojom and moves
printing::DuplexMode to this mojom file to share the enum types
with other directories.
It removes WebDuplexMode from //third_party/blink.

Bug: 1008939
Change-Id: Ic73da8abc7241d99f0be35ba18946addf63f3e4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2162388
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#764139}

• chrome/browser/chromeos/BUILD.gn[diff]
• chrome/browser/chromeos/arc/print/arc_print_service.cc[diff]
• chrome/browser/chromeos/arc/print/print_mojom_traits.cc[diff]
• chrome/browser/chromeos/arc/print_spooler/print_session_impl.cc[diff]
• chrome/browser/chromeos/extensions/printing/printing_api_handler_unittest.cc[diff]
• chrome/browser/chromeos/extensions/printing/printing_api_utils.cc[diff]
• chrome/browser/chromeos/extensions/printing/printing_api_utils_unittest.cc[diff]
• chrome/browser/chromeos/extensions/printing/printing_apitest.cc[diff]
• chrome/browser/chromeos/printing/history/print_job_info_proto_conversions.cc[diff]
• chrome/browser/chromeos/printing/history/print_job_info_proto_conversions_unittest.cc[diff]
• chrome/browser/printing/cloud_print/privet_http_unittest.cc[diff]
• chrome/browser/printing/print_test_utils.cc[diff]
• chrome/browser/printing/pwg_raster_converter.cc[diff]
• chrome/browser/printing/pwg_raster_converter_browsertest.cc[diff]
• chrome/browser/ui/BUILD.gn[diff]
• chrome/browser/ui/webui/print_preview/print_preview_handler.cc[diff]
• chrome/browser/ui/webui/print_preview/print_preview_handler.h[diff]
• chrome/services/printing/BUILD.gn[diff]
• chrome/services/printing/pdf_to_pwg_raster_converter.cc[diff]
• chrome/services/printing/public/mojom/BUILD.gn[diff]
• chrome/services/printing/public/mojom/pdf_to_pwg_raster_converter_mojom_traits.h[diff]
• chrome/test/BUILD.gn[diff]
• components/arc/mojom/BUILD.gn[diff]
• components/printing/common/BUILD.gn[diff]
• components/printing/common/cloud_print_cdd_conversion.cc[diff]
• components/printing/common/print_messages.cc[diff]
• components/printing/common/print_messages.h[diff]
• components/printing/common/printing_param_traits_macros.h[diff]
• components/printing/renderer/print_render_frame_helper.cc[diff]
• components/printing/test/BUILD.gn[diff]
• components/printing/test/print_render_frame_helper_browsertest.cc[diff]
• content/renderer/BUILD.gn[diff]
• content/renderer/pepper/pepper_plugin_instance_impl.cc[diff]
• printing/BUILD.gn[diff]
• printing/backend/cups_helper.cc[diff]
• printing/backend/cups_helper_unittest.cc[diff]
• printing/backend/cups_ipp_helper.cc[diff]
• printing/backend/cups_ipp_helper_unittest.cc[diff]
• printing/backend/print_backend.h[diff]
• printing/backend/print_backend_win.cc[diff]
• printing/mojom/BUILD.gn[Added - diff]
• printing/mojom/OWNERS[Added - diff]
• printing/mojom/print.mojom[Added - diff]
• printing/print_job_constants.h[diff]
• printing/print_settings.cc[diff]
• printing/print_settings.h[diff]
• printing/print_settings_conversion.cc[diff]
• printing/printing_context.cc[diff]
• printing/printing_context_chromeos.cc[diff]
• printing/printing_context_mac.h[diff]
• printing/printing_context_mac.mm[diff]
• printing/printing_context_win.cc[diff]
• printing/pwg_raster_settings.h[diff]
• third_party/blink/public/BUILD.gn[diff]
• third_party/blink/public/web/DEPS[diff]
• third_party/blink/public/web/web_print_preset_options.h[diff]
• ui/gtk/BUILD.gn[diff]
• ui/gtk/print_dialog_gtk.cc[diff]