SkPDF: eliminate unnecessary clip for each page

Somehow this improves the imagefilterscropped gm.

This also makes it easier for me to manually parse
PDF output for debugging.

Change-Id: I3af39f4b0ca3fc7fcdeec4825bf8649bd9544917
Reviewed-on: https://skia-review.googlesource.com/17413
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed