GraphicsContextGL has a couple non-robust getters
We should replace them with robust versions in order to support GPUP
Created attachment 415290 [details]
Created attachment 415291 [details]
Created attachment 415292 [details]
Committed r270400: <https://trac.webkit.org/changeset/270400>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 415292 [details].