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This change splits DocumentLayout::page_rect() into two methods,
page_rect() and page_bounds_rect(), to better mirror the corresponding
APIs in PDFEngine, GetPageRect() (page rectangle before insets) and
GetPageBoundsRect() (page rectangle after insets).

The existing page_rect() method is equivalent to PDFEngine's
GetPageBoundsRect(), which is confusing, so it has been renamed to
page_bounds_rect(). The new page_rect() method is equivalent to
PDFEngine's GetPageRect(). (This will be useful in a future change.)

DocumentLayout is now responsible for adding insets to the page
rectangles returned by draw_utils::GetRectForSingleView(), etc.,
eliminating the need to pass the insets to these functions.

Bug: 885110
Change-Id: I4ef345333abbb5b75892c32ffff8dee24e20ef05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762601Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: K Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689735}