This app was mentioned in
with an average of
Although I can't find what you describe in the link you gave, I believe that what you're after is a set of options like those that pop off the FAB in Inbox, for example. If that is correct, take a look at this: [link]
The purpose of the app is demoing something that is totally irrelevant to the point, but the rightmost FAB shows more options on tap similarly to how Google Inbox does it, I believe.
EDIT: Forgot to mention, the code is on GitHub, find a link on the Google Play entry!