Chromium is the open-source version of Google Chrome. Fixes T233
Notes of interest:
* Widevine support is enabled but not shipped due to legal reasons,
you can copy `libwidevinecdm.so` from google-chrome to enable it.
* Headless shell support is enabled (initial support)
* Expects PPAPI Pepper flash to be installed to `/usr/lib64/PepperFlash` for automatic support
* In the future a remoting desktop subpackage is planned (T1912)