add a download slices table into history download db

components/history/core/browser/download_job_info.cc

+// Copyright (c) 2017 The Chromium Authors. All rights reserved.

[sky, 2017/02/03 16:02:34]

no (c)

[qinmin, 2017/02/04 00:06:56]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/history/core/browser/download_job_info.h"
+
+#include "components/history/core/browser/download_constants.h"
+
+namespace history {
+
+DownloadJobInfo::DownloadJobInfo()
+    : download_id(0),

[sky, 2017/02/03 16:02:34]

kInvalidDownloadId?

[qinmin, 2017/02/04 00:06:56]

Done.

+      start_position(0),
+      length(0),
+      received_bytes(0),
+      state(DownloadState::IN_PROGRESS),

[sky, 2017/02/03 16:02:34]

You sure you don't want interrupted?

[qinmin, 2017/02/04 00:06:56]

When a job is created, it should always in the state of IN_PROGRESS.  So using
IN_PROGRESS is justified.

+      interrupt_reason(0) {}
+
+DownloadJobInfo::DownloadJobInfo(DownloadId download_id,
+                                 int job_id,
+                                 int64_t start_position,
+                                 int64_t length,
+                                 int64_t received_bytes,
+                                 DownloadState state,
+                                 DownloadInterruptReason interrupt_reason)
+    : download_id(download_id),
+      job_id(job_id),
+      start_position(start_position),
+      length(length),
+      received_bytes(received_bytes),
+      state(state),
+      interrupt_reason(interrupt_reason) {}
+
+DownloadJobInfo::DownloadJobInfo(const DownloadJobInfo& other) = default;
+
+DownloadJobInfo::~DownloadJobInfo() = default;
+
+bool DownloadJobInfo::operator==(const DownloadJobInfo& rhs) const {
+  return download_id == rhs.download_id && job_id == rhs.job_id &&
+      start_position == rhs.start_position &&
+      length == rhs.length &&
+      received_bytes == rhs.received_bytes && state == rhs.state &&
+      interrupt_reason == rhs.interrupt_reason;
+}
+
+}  // namespace history