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Update pdf/ to use gfx::Point/gfx::Vector2d instead of pp::Point based
on context. Apart from OutOfProcessInstance all other files in pdf/ now
use gfx::Point/gfx::Vector2d instead of pp::Point.

In the Pepper model, we have used pp::Point to denote a point as well as
a 2D vector. Based on the usage of the pp::Point migrate it to
gfx::Point or gfx::Vector2d. A position is represented by gfx::Point
while an offset is represented by gfx::Vector2d.

Bug: 1101101
Change-Id: I784fb886ff378cc7fd20722dfba6dd5ed3a55952
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329105
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800028}