Add PDFium_SkiaPaths bot

BUG=skia:6049

Change-Id: I90d06f9bb3d6180a0921130b9fe523733211e481
Reviewed-on: https://skia-review.googlesource.com/5849
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
6 files changed