Introduce HAVE(IOSURFACE_ACCELERATOR)
Created attachment 334245 [details] Patch
Created attachment 334248 [details] patch
<rdar://problem/37699510>
Created attachment 334289 [details] Patch
Created attachment 334309 [details] Patch
Created attachment 334311 [details] Patch
EWS is thwarting my attempts to test this
Created attachment 334318 [details] Patch
Comment on attachment 334318 [details] Patch Clearing flags on attachment: 334318 Committed r228853: <https://trac.webkit.org/changeset/228853>
All reviewed patches have been landed. Closing bug.