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GetPDFDocInfo() and GetPDFPageSizeByIndex() call PDFium APIs underneath
that use single precision, not double precision. Change their
signatures to reflect that fact.

Meanwhile, change the output of GetPDFPageSizeByIndex() from two
pointer parameters to a base::Optional<gfx::SizeF> return value.

Change-Id: I91e3645027f2345f930c6ee8ca886f84deed6897
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2393013Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804972}