[Offline pages] Add MarkAttemptAbortedTask to Request Queue

components/offline_pages/background/mark_attempt_aborted_task.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/mark_attempt_aborted_task.h"
+
+#include "base/bind.h"
+
+namespace offline_pages {
+
+MarkAttemptAbortedTask::MarkAttemptAbortedTask(
+    RequestQueueStore* store,
+    int64_t request_id,
+    const RequestQueueStore::UpdateCallback& callback)
+    : UpdateRequestTask(store, request_id, callback) {}
+
+MarkAttemptAbortedTask::~MarkAttemptAbortedTask() {}
+
+void MarkAttemptAbortedTask::UpdateRequestImpl(
+    std::unique_ptr<UpdateRequestsResult> read_result) {
+  if (!ValidateReadResult(read_result.get())) {
+    CompleteWithResult(std::move(read_result));
+    return;
+  }
+
+  // It is perfectly fine to reuse the read_result->updated_items collection, as
+  // it is owned by this callback and will be destroyed when out of scope.
+  read_result->updated_items[0].MarkAttemptAborted();
+  store()->UpdateRequests(
+      read_result->updated_items,
+      base::Bind(&MarkAttemptAbortedTask::CompleteWithResult, GetWeakPtr()));
+}
+
+}  // namespace offline_pages