Implement XP factory dumping

Bug: skia:
Change-Id: If2e6a20b072d895ca9770268db5006a9400f2e70
Reviewed-on: https://skia-review.googlesource.com/c/186180
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
7 files changed