Summary: - Define CSS_ASSERT_FAIL_ENABLED for P/Invoke (Visual Studio project already has it) - Pass managed delegate pointer to unmanaged side via P/Invoke. - CSSAssertFail will call the managed delegate when assert failed. - The delegate will throw managed exception. Reviewed By: emilsjolander Differential Revision: D3982084 fbshipit-source-id: 058a87c10ca89238362be4d8759cc00dd0c9b376