UK extended keyboard (backquote acting as a dead key for grave accent)
This extension provides a UK extended keyboard layout in Chrome OS. How to enable: after installing the extension, head over to chrome://settings/languages then add English (UK), and check the "UK extended" option. If the option does not show up, sign out once and retry the procedure. Switch keyboard layouts with Alt+Shift until you hit the UK extended keyboard (symbol: EN*).
Known issue: if this stopped working after updating to M36 please see crbug.com/397143 for a workaround (Chrome OS 37+ should not be affected)
V1.1: fixed the "not working as advertised issue" (the internal name of the key changed in Chrome OS)