How did my iPhone know what I had open in Chrome?

This is freaking me out...

I have a tab open in Chrome on my MBP that I wanted to share with my wife. She was texting me and I went to look at the text when I saw a Safari icon down in the left corner of the lock screen. I open it and it opens the same page I have open in Chrome on my MBP.

Safari isn't open on my MBP. The link is not copied on my phone or MBP.

What the heck? This is awesome, and creepy. Could someone explain?

edit: It just did it with this tab too. O.O edit2: Pretty sure it's a bluetooth feature. I even used a different Google Account, and it still went to my iPhone. It went away after turning off bluetooth.