Reintroduce plumbing for user gesture into permission system.

chrome/browser/background_sync/background_sync_permission_context.cc

 // 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.
 
 #include "chrome/browser/background_sync/background_sync_permission_context.h"
 
 #include "base/logging.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "content/public/browser/permission_type.h"
 
 BackgroundSyncPermissionContext::BackgroundSyncPermissionContext(
     Profile* profile)
     : PermissionContextBase(profile,
                             content::PermissionType::BACKGROUND_SYNC,
                             CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC) {}
 
 void BackgroundSyncPermissionContext::CancelPermissionRequest(
     content::WebContents* web_contents,
     const PermissionRequestID& id) {
   // Background sync permission requests are resolved instantly without
   // prompting the user, there is no way to cancel them.
   NOTREACHED();
 }
 
 void BackgroundSyncPermissionContext::DecidePermission(
     content::WebContents* web_contents,
     const PermissionRequestID& id,
     const GURL& requesting_origin,
     const GURL& embedding_origin,
+    bool user_gesture,
     const BrowserPermissionCallback& callback) {
   // The user should never be prompted to authorize background sync.
   NOTREACHED();
 }
 
 bool BackgroundSyncPermissionContext::IsRestrictedToSecureOrigins() const {
   return true;
 }