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This CL moves printing::SkiaDocumentType to print.mojom to pass it
to Mojo interfaces. This is a precursor CL to mojofy
PrintHostMsg_GetDefaultPrintSettings.

Bug: 1008939
Change-Id: Id4622825e97443dd7d96c65ac9d28a8c8fb9c552
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231922Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#777309}