Currently doesn't work with the recent Gmail redesign.
Specifically, when clipping a conversation in the new Gmail, on Chrome for MacOS it just does nothing at all; and on Chrome for ChromeOS, it tries but finds an "undefined" email message.
Yes! I have been looking for some time for a way to do this in Android. It's absurd that this hasn't been dealt with. Especially with the increased power of Android devices and now the ability to run android apps on Chromebooks, the Android version must be made more powerful - more like the desktop versions.