servo_render_context_draw_push_clip.rs

    pub fn draw_push_clip(&self, bounds: &Rect<Au>) {
        let rect = bounds.to_azure_rect();
        let path_builder = self.draw_target.create_path_builder();

        let left_top = Point2D(rect.origin.x, rect.origin.y);
        let right_top = Point2D(rect.origin.x + rect.size.width, rect.origin.y);
        let left_bottom = Point2D(rect.origin.x, rect.origin.y + rect.size.height);
        let right_bottom = Point2D(rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);

        path_builder.move_to(left_top);
        path_builder.line_to(right_top);
        path_builder.line_to(right_bottom);
        path_builder.line_to(left_bottom);

        let path = path_builder.finish();
        self.draw_target.push_clip(&path);
    }