virtual void WillCommit() OVERRIDE {}
virtual void DidCommit() OVERRIDE {}
virtual void DidCommitAndDrawFrame() OVERRIDE {}
virtual void DidCompleteSwapBuffers() OVERRIDE {}
virtual void WillCommit() OVERRIDE {}
virtual void DidCommit() OVERRIDE {}
virtual void DidCommitAndDrawFrame() OVERRIDE {}
virtual void DidCompleteSwapBuffers() OVERRIDE {}