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In single-view, pages are horizontally centered within the document.
This centering is being done in PDFiumEngine, making it difficult to
test.

This CL moves the centering logic for single-view to
draw_utils::CenterRectHorizontally(). This allows us to test the logic.

Bug: 51472
Change-Id: Idd67cde3c57d4155c9e02ca82a36ad19a6205f08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730524
Commit-Queue: Jeremy Chinsen <chinsenj@google.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683387}