Add layout tests for ServiceWorker's notificationclose event.

content/shell/browser/layout_test/layout_test_notification_manager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_
 
 #include <stdint.h>
 #include <map>
 #include <string>
@@ skipping 16 matching lines @@
 class LayoutTestNotificationManager : public PlatformNotificationService {
  public:
   LayoutTestNotificationManager();
   ~LayoutTestNotificationManager() override;
 
   // Simulates a click on the notification titled |title|. |action_index|
   // indicates which action was clicked, or -1 if the main notification body was
   // clicked. Must be called on the UI thread.
   void SimulateClick(const std::string& title, int action_index);
 
+  // Simulates the closing a notification titled |title|. Must be called on
+  // the UI thread.
+  void SimulateClose(const std::string& title, bool by_user);
+
   // PlatformNotificationService implementation.
   blink::WebNotificationPermission CheckPermissionOnUIThread(
       BrowserContext* browser_context,
       const GURL& origin,
       int render_process_id) override;
   blink::WebNotificationPermission CheckPermissionOnIOThread(
       ResourceContext* resource_context,
       const GURL& origin,
       int render_process_id) override;
   void DisplayNotification(BrowserContext* browser_context,
@@ skipping 42 matching lines @@
   std::map<std::string, std::string> replacements_;
 
   base::WeakPtrFactory<LayoutTestNotificationManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutTestNotificationManager);
 };
 
 }  // content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_NOTIFICATION_MANAGER_H_