Bug 1223540 - Add a pref for CGL's multithreaded mode (CEMPEngine). r=jrmuizel

--HG--
extra : commitid : 6osvwNBJqWR

modules/libpref/init/all.js

@@ -4169,7 +4169,7 @@ pref("gl.msaa-level", 2);
 #endif
 pref("gl.require-hardware", false);
 #ifdef XP_MACOSX
-pref("gl.multithreaded", false);
+pref("gl.multithreaded", true);
 #endif
 
 pref("webgl.force-enabled", false);