add a download slices table into history download db

components/history/core/browser/download_job_info_unittest.cc

Index: components/history/core/browser/download_job_info_unittest.cc
diff --git a/components/history/core/browser/download_job_info_unittest.cc b/components/history/core/browser/download_job_info_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ff6eca090382f003d1d401fcdbc4d61751e2d4c5
--- /dev/null
+++ b/components/history/core/browser/download_job_info_unittest.cc
@@ -0,0 +1,27 @@
+// 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 "components/history/core/browser/download_job_info.h"
+
+#include "components/history/core/browser/download_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace history {
+
+TEST(DownloadJobInfoTest, CompareDownloadJobInfo) {
+  DownloadJobInfo info1(1, 1, 500, 1000, 10, DownloadState::IN_PROGRESS, 0);
+  DownloadJobInfo info2(1, 1, 500, 1000, 1000, DownloadState::COMPLETE, 0);
+  EXPECT_FALSE(info1 == info2);
+
+  info1.received_bytes = 1000;
+  EXPECT_FALSE(info1 == info2);
+
+  info1.state = DownloadState::COMPLETE;
+  EXPECT_EQ(info1, info2);
+
+  info1.interrupt_reason = 1;
+  EXPECT_FALSE(info1 == info2);
+}
+
+}  // namespace history