Add support for pulling icons for OfflineItems

components/offline_items_collection/core/offline_content_aggregator.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 <algorithm>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 127 matching lines @@
     if (!provider->AreItemsAvailable())
       continue;
 
     OfflineItemList provider_items = provider->GetAllItems();
     items.insert(items.end(), provider_items.begin(), provider_items.end());
   }
 
   return items;
 }
 
+void OfflineContentAggregator::GetVisualsForItem(
+    const ContentId& id,
+    const VisualsCallback& callback) {
+  auto it = providers_.find(id.name_space);
+
+  if (it == providers_.end()) {
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(callback, id, nullptr));
+    return;
+  }
+
+  it->second->GetVisualsForItem(id, callback);
+}
+
 void OfflineContentAggregator::AddObserver(
     OfflineContentProvider::Observer* observer) {
   DCHECK(observer);
   if (observers_.HasObserver(observer))
     return;
 
   observers_.AddObserver(observer);
 
   if (sent_on_items_available_) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
@@ skipping 96 matching lines @@
 
 void OfflineContentAggregator::RunIfReady(OfflineContentProvider* provider,
                                           const base::Closure& action) {
   if (provider->AreItemsAvailable())
     action.Run();
   else
     pending_actions_[provider].push_back(action);
 }
 
 }  // namespace offline_items_collection