clients who want to preserve a context for a later callback.

Patch by Geoffrey Garen <ggaren@apple.com> on 2009-10-19
Reviewed by Sam Weinig.

* API/APICast.h:
(toGlobalRef): Added an ASSERT, since this function is used more often
than before.

* API/JSContextRef.cpp:
* API/JSContextRefPrivate.h: Added. The new API.

* API/tests/testapi.c:
(print_callAsFunction):
(main): Test the new API.

* JavaScriptCore.exp:
* JavaScriptCore.xcodeproj/project.pbxproj: Build and export the new API.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49802 268f45cc-cd09-0410-ab3c-d52691b4dbfc