[Offline pages] Extracting AddRequest method in RequestQueueStore

components/offline_pages/offline_page_metadata_store.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 COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/callback.h"
 #include "components/offline_pages/offline_page_item.h"
+#include "components/offline_pages/offline_page_types.h"
 
 class GURL;
 
 namespace offline_pages {
 
 // TODO(fgorski): This enum is meant to replace |LoadStatus|.
 // Current store state. When LOADED, the store is operational. When
 // initialization or reset fails, it is reflected appropriately.
 enum class StoreState {
   NOT_LOADED,      // Store is not loaded yet.
   LOADED,          // Store is properly loaded and operational.
   FAILED_LOADING,  // Store initialization failed.
   FAILED_RESET,    // Resetting the store failed.
 };
 
-// Statuses referring to actions taken on items in the store.
-enum class ItemActionStatus {
-  SUCCESS,
-  ALREADY_EXISTS,
-  NOT_FOUND,
-  STORE_ERROR,
-};
-
 class StoreUpdateResult {
  public:
   explicit StoreUpdateResult(StoreState state);
   ~StoreUpdateResult();
 
   // List of Offline ID to item action status mappings.
   // It is meant to be consumed by the original caller of the operation.
   std::vector<std::pair<int64_t, ItemActionStatus>> item_statuses;
 
   // List of successfully updated offline page items as seen after operation
@@ skipping 52 matching lines @@
   // Resets the store.
   virtual void Reset(const ResetCallback& callback) = 0;
 
   // Gets the store state.
   virtual StoreState state() const = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_H_