Add support for pulling icons for OfflineItems

components/offline_items_collection/core/throttled_offline_content_provider.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_ITEMS_COLLETION_CORE_THROTTLED_OFFLINE_CONTENT_PROVIDER_H_
 #define COMPONENTS_OFFLINE_ITEMS_COLLETION_CORE_THROTTLED_OFFLINE_CONTENT_PROVIDER_H_
 
 #include <map>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 25 matching lines @@
   void RemoveItem(const ContentId& id) override;
   void CancelDownload(const ContentId& id) override;
   void PauseDownload(const ContentId& id) override;
   void ResumeDownload(const ContentId& id) override;
 
   // Because this class queues updates, a call to Observer::OnItemUpdated might
   // get triggered with the same contents as returned by these getter methods in
   // the future.
   const OfflineItem* GetItemById(const ContentId& id) override;
   OfflineItemList GetAllItems() override;
+  void GetVisualsForItem(const ContentId& id,
+                         const VisualsCallback& callback) override;
   void AddObserver(OfflineContentProvider::Observer* observer) override;
   void RemoveObserver(OfflineContentProvider::Observer* observer) override;
 
  private:
   // OfflineContentProvider::Observer implementation.
   void OnItemsAvailable(OfflineContentProvider* provider) override;
   void OnItemsAdded(const OfflineItemList& items) override;
   void OnItemRemoved(const ContentId& id) override;
   void OnItemUpdated(const OfflineItem& item) override;
 
@@ skipping 18 matching lines @@
   OfflineItemMap updates_;
 
   base::WeakPtrFactory<ThrottledOfflineContentProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThrottledOfflineContentProvider);
 };
 
 }  // namespace offline_items_collection
 
 #endif  // COMPONENTS_OFFLINE_ITEMS_COLLETION_CORE_THROTTLED_OFFLINE_CONTENT_PROVIDER_H_