Implement PermissionService::GetNextPermissionChange.

chrome/browser/chrome_content_browser_client.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 172 matching lines @@
       content::WebContents* web_contents,
       int bridge_id,
       const GURL& requesting_frame,
       bool user_gesture,
       const base::Callback<void(content::PermissionStatus)>& callback) override;
   content::PermissionStatus GetPermissionStatus(
       content::PermissionType permission,
       content::BrowserContext* browser_context,
       const GURL& requesting_origin,
       const GURL& embedding_origin) override;
+  int SubscribePermissionStatusChange(
+      content::PermissionType permission,
+      content::BrowserContext* browser_context,
+      const GURL& requesting_origin,
+      const GURL& embedding_origin,
+      const base::Callback<void(content::PermissionStatus)>& callback) override;
+  void UnsubscribePermissionStatusChange(
+      content::BrowserContext* browser_context,
+      int subscription_id) override;
   void ResetPermission(
       content::PermissionType permission,
       content::BrowserContext* browser_context,
       const GURL& requesting_origin,
       const GURL& embedding_origin) override;
   void CancelPermissionRequest(content::PermissionType permission,
                                content::WebContents* web_contents,
                                int bridge_id,
                                const GURL& requesting_frame) override;
   void RegisterPermissionUsage(content::PermissionType permission,
@@ skipping 131 matching lines @@
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;
 
   base::WeakPtrFactory<ChromeContentBrowserClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_