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Currently draw_utils::GetSurroundingRect() takes a pp::Rect object
and uses only the y-component and height, which means it uses only
half of the structs attributes.

This refactor makes it so GetSurroundingRect() just takes |page_y|
and |page_height| as individual int values, reducing the amount of
unnecessary data sent.

Change-Id: Ie201b4e2d5d6f3c246173782af43cb44890014ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715789Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@google.com>
Cr-Commit-Position: refs/heads/master@{#680132}