Teach Background Fetch how to start a new fetch.

content/browser/background_fetch/background_fetch_registration_id.cc

 // Copyright 2017 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 "content/browser/background_fetch/background_fetch_registration_id.h"
 
 namespace content {
 
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
     int64_t service_worker_registration_id,
     const url::Origin& origin,
     const std::string& tag)
     : service_worker_registration_id_(service_worker_registration_id),
       origin_(origin),
       tag_(tag) {}
 
 BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
+    const BackgroundFetchRegistrationId& other) = default;
+
+BackgroundFetchRegistrationId::BackgroundFetchRegistrationId(
     BackgroundFetchRegistrationId&& other) = default;
 
 BackgroundFetchRegistrationId::~BackgroundFetchRegistrationId() = default;
 
 bool BackgroundFetchRegistrationId::operator==(
     const BackgroundFetchRegistrationId& other) const {
   return other.service_worker_registration_id_ ==
              service_worker_registration_id_ &&
          other.origin_ == origin_ && other.tag_ == tag_;
 }
 
 bool BackgroundFetchRegistrationId::operator!=(
     const BackgroundFetchRegistrationId& other) const {
   return !(*this == other);
 }
 
 bool BackgroundFetchRegistrationId::operator<(
     const BackgroundFetchRegistrationId& other) const {
   return service_worker_registration_id_ <
              other.service_worker_registration_id_ ||
          origin_ < other.origin_ || tag_ < other.tag_;
 }
 
 }  // namespace content