Fix issues around GL on incorrect thread

    // TODO: rename for consistency

    virtual status_t callDrawGLFunction(Functor* functor, Rect& dirty);

protected:

    // NOTE: must override these to avoid calling into super class, which calls GL. These may be

    // removed once DisplayListRenderer no longer inherits from OpenGLRenderer

    virtual void onViewportInitialized() {};

    virtual void onSnapshotRestored() {};

private:

    void insertRestoreToCount();