SkPDF: Non-outline glyphs as images

    - Cache images in PDF Canon for de-duping
    - For now, rasterize at text scale.  in the future, look at CTM and
      fRasterScale.
    - add a test that works on MacOS

BUG=chromium:705480
BUG=skia:3489
Change-Id: I4fbc42f218e5b81ea15ea6cdccc61c91e532f6d0
Reviewed-on: https://skia-review.googlesource.com/24080
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed