Create updated Chrome emulator plugins

[blakebyrnes]

We need to create updated Chrome plugins. When we add these, we should add the ability for emulators to choose their own rendering engine. To consider:

1. Create a central repository that emulators can tap into. This would mean Emulators or SA is responsible for providing paths to different engines.
2. Or emulators package their own rendering engine. This might be preferable if, for example, someone wanted to use a patched version of a browser