Prefetching: Introduce store commands abstractions to be used by tasks.

components/offline_pages/core/prefetch/prefetch_types.h

 // 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.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_TYPES_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_TYPES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 90 matching lines @@
 enum class PrefetchItemErrorCode {
   SUCCESS,
   EXPIRED,
 };
 
 // Callback invoked upon completion of a prefetch request.
 using PrefetchRequestFinishedCallback =
     base::Callback<void(PrefetchRequestStatus status,
                         const std::vector<RenderPageInfo>& pages)>;
 
-// Holds information about a new URL to be prefetched.
+// Holds information about a suggested URL to be prefetched.
 struct PrefetchURL {
-  PrefetchURL(const ClientId& client_id, const GURL& url)
-      : client_id(client_id), url(url) {}
+  PrefetchURL(const std::string& id, const GURL& url) : id(id), url(url) {}
 
-  // Client provided ID to allow the matching of URLs to the respective work
-  // item in the prefetching system. It can be anything useful to identify the
-  // page . It will not be used internally for de-duplication.
-  ClientId client_id;
+  // Client provided ID to allow the matching of provided URLs to the respective
+  // work item in the prefetching system within that client's assigned
+  // namespace. It can be any string value and it will not be used internally
+  // for de-duplication.
+  std::string id;
 
   // This URL will be prefetched by the service.
   GURL url;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_TYPES_H_