(See http://www.chromium.org/blink#launch-process for an overview)

Change description:
The API attribute provides a convenient way of working with the query portion of a URL by way of a URLSearchParams object.

Changes to API surface:
Adds the URL.searchParams attribute (readonly), defined in https://url.spec.whatwg.org/#dom-url-searchparams

Links:
Spec: https://url.spec.whatwg.org/#dom-url-searchparams
Intent (for URLSearchParams and this attribute): https://groups.google.com/a/chromium.org/d/msg/blink-dev/grHZDbldP04/JdsoQ169AQAJ
Feature dashboard: https://www.chromestatus.com/feature/5644164582604800

Support in other browsers:
Internet Explorer: ?
Firefox: >= 29
Safari: No