As a proof-of-concept following the discussion on my blog post about developing with Google Photos yesterday  the element now also allows you to specify a "tag" instead of an album ID. Apparently the automatic image recognition features of Google Photos generate hidden tags for the photos that can be searched via the Picasa API (even though they don't appear anywhere visibly otherwise) 
Here an example searching for the tag "sunset" in my public photos:
The seemingly random photos in between are because they are in an album that includes the word "sunset". The results of the Picasa API match the results I see when searching for sunset on Google Photos.
So at least we have some programmatic access to "new" features in Google Photos. Note that this feature has probably been available for a while, but it never occured to me to test it.
#gde #opensourcecode #polymer #googleplus