Implement PermissionService::GetNextPermissionChange.

android_webview/browser/aw_permission_manager.h

 // Copyright 2015 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 ANDROID_WEBVIEW_BROWSER_AW_PERMISSION_MANAGER_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_PERMISSION_MANAGER_H_
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "content/public/browser/permission_manager.h"
@@ skipping 20 matching lines @@
   void ResetPermission(content::PermissionType permission,
                        const GURL& requesting_origin,
                        const GURL& embedding_origin) override;
   content::PermissionStatus GetPermissionStatus(
       content::PermissionType permission,
       const GURL& requesting_origin,
       const GURL& embedding_origin) override;
   void RegisterPermissionUsage(content::PermissionType permission,
                                const GURL& requesting_origin,
                                const GURL& embedding_origin) override;
+  int SubscribePermissionStatusChange(
+      content::PermissionType permission,
+      const GURL& requesting_origin,
+      const GURL& embedding_origin,
+      const base::Callback<void(content::PermissionStatus)>& callback) override;
+  void UnsubscribePermissionStatusChange(int subscription_id) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AwPermissionManager);
 };
 
 } // namespace android_webview
 
 #endif // ANDROID_WEBVIEW_BROWSER_AW_PERMISSION_MANAGER_H_