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Adds a service request and callback to get Google Photos from an album.
An access token for the signed-in user with requisite scope is
obtained and used in the request.

Bug: 839152
Change-Id: I3b012b8cdba247d94052c774dd0b1ae1be070d14
Reviewed-on: https://chromium-review.googlesource.com/1114231Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574442}