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This fixes a regression after https://crrev.com/c/1861035 that caused a
web page to require more printed pages due to an inconsistency of rounding
directions.
We used to implicitly round the rect returned by LayoutView::DocumentRect(),
as it used to return a snapped-to-int rect. Now that we've started returning
a PhysicalRect, it gets to ResizePageRectsKeepingRatio() as is and gets
truncated there. So let's round sizes explicitly before passing to
ResizePageRectsKeepingRatio().

BUG=650768, b/142742179

Change-Id: I55a9df6977f464452fc4878517796717761c5b07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867126Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709153}