The spec has this to say.

"
All resources associated with surface which were allocated by EGL are marked for deletion as soon as possible. If surface is current to any thread (see section 3.7.3), resources are not actually released while the surface remains current. Future references to surface remain valid only so long as it is current; it will be destroyed, and all future references to it will become invalid, as soon as any otherwise valid eglMakeCurrent call is made from the thread it is bound to."
Review URL: http://codereview.appspot.com/4449064

git-svn-id: https://angleproject.googlecode.com/svn/trunk@632 736b8ea6-26fd-11df-bfd4-992fa37f6226