[Offline pages] Extracting AddRequest method in RequestQueueStore

components/offline_pages/background/request_queue_in_memory_store.cc

 // Copyright 2016 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 "components/offline_pages/background/request_queue_in_memory_store.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/offline_pages/background/save_page_request.h"
@@ skipping 10 matching lines @@
   for (const auto& id_request_pair : requests_) {
     std::unique_ptr<SavePageRequest> request(
         new SavePageRequest(id_request_pair.second));
     result_requests.push_back(std::move(request));
   }
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(callback, true, base::Passed(std::move(result_requests))));
 }
 
+void RequestQueueInMemoryStore::AddRequest(const SavePageRequest& request,
+                                           const AddCallback& callback) {
+  RequestsMap::iterator iter = requests_.find(request.request_id());
+  ItemActionStatus status;
+  if (iter == requests_.end()) {
+    requests_.insert(std::make_pair(request.request_id(), request));
+    status = ItemActionStatus::SUCCESS;
+  } else {
+    status = ItemActionStatus::ALREADY_EXISTS;
+  }
+
+  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
+                                                base::Bind(callback, status));
+}
+
 void RequestQueueInMemoryStore::AddOrUpdateRequest(
     const SavePageRequest& request,
     const UpdateCallback& callback) {
   RequestsMap::iterator iter = requests_.find(request.request_id());
   if (iter != requests_.end())
     requests_.erase(iter);
   requests_.insert(std::make_pair(request.request_id(), request));
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, UpdateStatus::UPDATED));
 }
@@ skipping 56 matching lines @@
       base::Bind(callback, results, base::Passed(std::move(requests))));
 }
 
 void RequestQueueInMemoryStore::Reset(const ResetCallback& callback) {
   requests_.clear();
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(callback, true));
 }
 
 }  // namespace offline_pages