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This CL changes PrintPreviewHandler to obtain the sign in state from the
identity service, and send this with initial settings. This will
eventually allow Print Preview to set the initial cloudPrintState
without querying the cloud print server.

Bug: 961359
Change-Id: I4382801b7e9a474e3664966d1794e4f4d6b0a7a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616329
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661000}