Earlier this week, Jennifer Slegg - who is spotting tons of tests these days on her device - spotted Google AdWords with the mobile friendly label on them. I cannot replicate but some can both on iOS devices and Android devices.
Here is a picture of an AdWords ad on Google mobile search results as I see it:
This is how Jennifer Slegg sees it with a "mobile friendly" label on the AdWords ad:
This is something Google is testing, it is not clear if this makes a difference in terms of ranking the ad, I suspect not right now.
Jennifer shared this picture with me on Twitter and Glenn Gab shared one on Twitter on his Android device.
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Forum discussion at Twitter.