GitLab

Switches the painting code in pdf/ to use the new abstract Graphics API,
instead of using pp::Graphics2D directly. This eliminates direct
dependencies on Pepper in the painting code.

Bug: 1099020
Change-Id: Ib848d6824fa0cedd5737d56ceae9927754348cdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321706Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792478}