[Presentation API] Allow PresentationConnection state change to "Connecting"

third_party/WebKit/LayoutTests/presentation/resources/presentation-service-mock.js

 /*
  * Mock implementation of mojo PresentationService.
  */
 
 "use strict";
 
-let presentationServiceMock = loadMojoModules(
-    'presentationServiceMock',
-    [
+const presentationServiceMock =
+    loadMojoModules('presentationServiceMock', [
       'third_party/WebKit/public/platform/modules/presentation/presentation.mojom',
       'mojo/public/js/bindings',
     ]).then(mojo => {
-      let [ presentationService, bindings ] = mojo.modules;
+      const [presentationService, bindings] = mojo.modules;
 
       class PresentationServiceMock {
         constructor(interfaceProvider) {
           interfaceProvider.addInterfaceOverrideForTesting(
               presentationService.PresentationService.name,
               handle => this.bindingSet_.addBinding(this, handle));
           this.interfaceProvider_ = interfaceProvider;
           this.pendingResponse_ = null;
           this.bindingSet_ = new bindings.BindingSet(
               presentationService.PresentationService);
         }
 
+        setClient(client) { this.client_ = client; }
+
         startSession(urls) {
           return Promise.resolve({
               sessionInfo: { url: urls[0], id: 'fakesession' },
               error: null,
           });
         }
 
         joinSession(urls) {
           return Promise.resolve({
               sessionInfo: { url: urls[0], id: 'fakeSessionId' },
               error: null,
           });
         }
+
+        closeConnection(url, id) {
+          this.client_.onConnectionClosed(
+              {url: url, id: id},
+              presentationService.PresentationConnectionCloseReason.CLOSED, '');
+        }
       }
 
       return new PresentationServiceMock(mojo.frameInterfaces);
     });
 
 function waitForClick(callback, button) {
   button.addEventListener('click', callback, { once: true });
 
   if (!('eventSender' in window))
     return;
 
-  var boundingRect = button.getBoundingClientRect();
-  var x = boundingRect.left + boundingRect.width / 2;
-  var y = boundingRect.top + boundingRect.height / 2;
+  const boundingRect = button.getBoundingClientRect();
+  const x = boundingRect.left + boundingRect.width / 2;
+  const y = boundingRect.top + boundingRect.height / 2;
 
   eventSender.mouseMoveTo(x, y);
   eventSender.mouseDown();
   eventSender.mouseUp();
 }