Reintroduce plumbing for user gesture into permission system.

chrome/browser/background_sync/background_sync_permission_context.h

 // Copyright 2016 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_BACKGROUND_SYNC_BACKGROUND_SYNC_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_PERMISSION_CONTEXT_H_
 
 #include "base/macros.h"
 #include "chrome/browser/permissions/permission_context_base.h"
 
@@ skipping 14 matching lines @@
   // PermissionContextBase:
   void CancelPermissionRequest(content::WebContents* web_contents,
                                const PermissionRequestID& id) override;
 
  private:
   // PermissionContextBase:
   void DecidePermission(content::WebContents* web_contents,
                         const PermissionRequestID& id,
                         const GURL& requesting_origin,
                         const GURL& embedding_origin,
+                        bool user_gesture,
                         const BrowserPermissionCallback& callback) override;
   bool IsRestrictedToSecureOrigins() const override;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_PERMISSION_CONTEXT_H_