Download driver for components/download.

components/download/content/driver_entry.h

Index: components/download/content/driver_entry.h
diff --git a/components/download/content/driver_entry.h b/components/download/content/driver_entry.h
new file mode 100644
index 0000000000000000000000000000000000000000..55c979d0ec00887c840aa8de9f2edaec372a9b64
--- /dev/null
+++ b/components/download/content/driver_entry.h
@@ -0,0 +1,66 @@
+// 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.
+
+#ifndef COMPONENTS_DOWNLOAD_CONTENT_DRIVER_ENTRY_H_
+#define COMPONENTS_DOWNLOAD_CONTENT_DRIVER_ENTRY_H_
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+
+namespace net {
+class HttpResponseHeaders;
+}  // namespace net
+
+namespace content {
+class DownloadItem;
+}  // namespace content
+
+namespace download {
+
+// A snapshot of the states of a download. It's preferred to use the data on the
+// fly and query new ones from download driver, instead of caching the states.
+struct DriverEntry {
+  // States of the download. Mostly maps to
+  // content::DownloadItem::DownloadState.
+  enum class State {
+    IN_PROGRESS = 0,
+    COMPLETE = 1,
+    CANCELLED = 2,
+    INTERRUPTED = 3,
+    UNKNOWN = 4, /* Not created from a download item object. */
+  };
+
+  // Create an entry from a download item.
+  static DriverEntry Create(const content::DownloadItem* item);
+  DriverEntry();
+  DriverEntry(const DriverEntry& other);
+  ~DriverEntry();
+
+  // Returns true if the driver entry is not filled with valid data.
+  bool empty() const;

[David Trainor- moved to gerrit, 2017/05/18 18:29:44]

valid?

[xingliu, 2017/05/18 22:21:50]

Done.

+
+  // The unique identifier of the download.
+  std::string guid;
+
+  // The current state of the download.
+  State state;
+
+  // If the download is paused.
+  bool paused;
+
+  // The number of bytes downloaded.
+  uint64_t bytes_downloaded;
+
+  // The expected total size of the download, set to 0 if the Content-Length
+  // http header is not presented.
+  uint64_t expected_total_size;
+
+  // The response headers for the download.

[David Trainor- moved to gerrit, 2017/05/18 18:29:44]

"...for the most recent download request?"

[xingliu, 2017/05/18 22:21:50]

Done.

+  scoped_refptr<const net::HttpResponseHeaders> response_headers;
+};
+
+}  // namespace download
+
+#endif  // COMPONENTS_DOWNLOAD_CONTENT_DRIVER_ENTRY_H_