Update IDL to 1847

modules/serviceworkers/ServiceWorkerContainer.idl

Index: modules/serviceworkers/ServiceWorkerContainer.idl
diff --git a/modules/serviceworkers/ServiceWorker.idl b/modules/serviceworkers/ServiceWorkerContainer.idl
similarity index 85%
copy from modules/serviceworkers/ServiceWorker.idl
copy to modules/serviceworkers/ServiceWorkerContainer.idl
index b58eb9005dc907d0e3b48c26e6d07c517ee0f85e..c6ab688c54e4466bab1267fcdb754c3126abf415 100644
--- a/modules/serviceworkers/ServiceWorker.idl
+++ b/modules/serviceworkers/ServiceWorkerContainer.idl
@@ -27,8 +27,12 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
 [
     RuntimeEnabled=ServiceWorker,
     NoInterfaceObject
-] interface ServiceWorker {
+] interface ServiceWorkerContainer {
+  [CallWith=ExecutionContext, ImplementedAs=registerServiceWorker] Promise
+  register(DOMString url, optional Dictionary options);
+  [CallWith=ExecutionContext, ImplementedAs=unregisterServiceWorker] Promise unregister(optional DOMString scope);
 };