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This CL changes BackgroundPart::location from pp::Rect to gfx::Rect so
that `background_parts_` can be migrated to PdfViewPluginBase later.

Bug: 1101101
Change-Id: Ib2ab5ab6cfb4c58bde3a2a4e71fd2886231a8a4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625088
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843242}