Return additional info in WebPrintPresetOptions:
Return additional info in WebPrintPresetOptions:

- Whether all the pages in the document are the same size.
- And if so, the page size in points.

BUG=158752

Review URL: https://codereview.chromium.org/980733002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191592 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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