Hotkeys aren't captured within iframes

[jchang504]

Hotkeys work on the rest of the page, but not when focused on the editing window. This initially looked like #2, but I don't see the same console messages about sandboxing. There are some messages about scripts being blocked on a slow connection, but I don't see the confirmation message it mentions, I'm not on a slow connection so there's no reason for our content script to be blocked, and I don't see any mention of KeepTabs (it seems related to ads scripts). Logs are attached:
www.yamli.com-1491788063736.txt

[jchang504]

Also noted within text box of a follow-up on Piazza. Nothing comes out in the logs (normal behavior when focused on the page outside of the editing box).

[jchang504]

Observed this in https://hangouts.google.com as well within chat windows. I'm pretty sure it's because they're iframes. Looks like there may be a simple solution, though I'm not sure if this handles dynamically generated (e.g. chat boxes) iframes.