function window(windowHandle) {
    var data = {};
    var requestOptions = {
        path: '/session/:sessionId/window',
        method: 'DELETE'
    };

    if (typeof windowHandle === 'string') {
        data = {
            name: windowHandle, // json wire conform
            handle: windowHandle // webdriver conform
        };
        requestOptions.method = 'POST';
    }

    return this.requestHandler.create(requestOptions, data);
}
Protocol binding to handle with tabs in the browser.

<example>
    :window.js
    // change focus to another window
    // using window handle
    browser.window('{dc30381e-e2f3-9444-8bf3-12cc44e8372a}');

    // using tab name attribute
    browser.window('my tab');

    // close the current window
    browser.window();
</example>

@param {String=} windowHandle the window to change focus to

@see  https://w3c.github.io/webdriver/webdriver-spec.html#switch-to-window
@see  https://w3c.github.io/webdriver/webdriver-spec.html#close-window
@type protocol