Move most of the component updater artifacts to update_client.

components/update_client/crx_update_item.h

Index: components/update_client/crx_update_item.h
diff --git a/components/update_client/crx_update_item.h b/components/update_client/crx_update_item.h
new file mode 100644
index 0000000000000000000000000000000000000000..ba38a1b6c8694e9292998d2255f6c8ff90acba1a
--- /dev/null
+++ b/components/update_client/crx_update_item.h
@@ -0,0 +1,129 @@
+// Copyright 2014 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_UPDATE_CLIENT_CRX_UPDATE_ITEM_H_
+#define COMPONENTS_UPDATE_CLIENT_CRX_UPDATE_ITEM_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
+#include "base/version.h"
+#include "components/update_client/crx_downloader.h"
+#include "components/update_client/update_client.h"
+
+namespace update_client {
+
+// This is the one and only per-item state structure. Designed to be hosted
+// in a std::vector or a std::list. The two main members are |component|
+// which is supplied by the the component updater client and |status| which
+// is modified as the item is processed by the update pipeline. The expected
+// transition graph is:
+//
+//                  on-demand                on-demand
+//   +---------------------------> kNew <--------------+-------------+
+//   |                              |                  |             |
+//   |                              V                  |             |
+//   |   +--------------------> kChecking -<-------+---|---<-----+   |
+//   |   |                          |              |   |         |   |
+//   |   |            error         V       no     |   |         |   |
+//  kNoUpdate <---------------- [update?] ->---- kUpToDate     kUpdated
+//     ^                            |                              ^
+//     |                        yes |                              |
+//     |        diff=false          V                              |
+//     |          +-----------> kCanUpdate                         |
+//     |          |                 |                              |
+//     |          |                 V              no              |
+//     |          |        [differential update?]->----+           |
+//     |          |                 |                  |           |
+//     |          |             yes |                  |           |
+//     |          |   error         V                  |           |
+//     |          +---------<- kDownloadingDiff        |           |
+//     |          |                 |                  |           |
+//     |          |                 |                  |           |
+//     |          |   error         V                  |           |
+//     |          +---------<- kUpdatingDiff ->--------|-----------+ success
+//     |                                               |           |
+//     |              error                            V           |
+//     +----------------------------------------- kDownloading     |
+//     |                                               |           |
+//     |              error                            V           |
+//     +------------------------------------------ kUpdating ->----+ success
+//
+struct CrxUpdateItem {
+  enum Status {
+    kNew,
+    kChecking,
+    kCanUpdate,
+    kDownloadingDiff,
+    kDownloading,
+    kUpdatingDiff,
+    kUpdating,
+    kUpdated,
+    kUpToDate,
+    kNoUpdate,
+    kLastStatus
+  };
+
+  // Call CrxUpdateService::ChangeItemState to change |status|. The function may
+  // enforce conditions or notify observers of the change.
+  Status status;
+
+  std::string id;
+  CrxComponent component;
+
+  base::Time last_check;
+
+  // A component can be made available for download from several urls.
+  std::vector<GURL> crx_urls;
+  std::vector<GURL> crx_diffurls;
+
+  // The from/to version and fingerprint values.
+  Version previous_version;
+  Version next_version;
+  std::string previous_fp;
+  std::string next_fp;
+
+  // True if the current update check cycle is on-demand.
+  bool on_demand;
+
+  // True if the differential update failed for any reason.
+  bool diff_update_failed;
+
+  // The error information for full and differential updates.
+  // The |error_category| contains a hint about which module in the component
+  // updater generated the error. The |error_code| constains the error and
+  // the |extra_code1| usually contains a system error, but it can contain
+  // any extended information that is relevant to either the category or the
+  // error itself.
+  int error_category;
+  int error_code;
+  int extra_code1;
+  int diff_error_category;
+  int diff_error_code;
+  int diff_extra_code1;
+
+  std::vector<CrxDownloader::DownloadMetrics> download_metrics;
+
+  std::vector<base::Closure> ready_callbacks;
+
+  CrxUpdateItem();
+  ~CrxUpdateItem();
+
+  // Function object used to find a specific component.
+  class FindById {
+   public:
+    explicit FindById(const std::string& id) : id_(id) {}
+
+    bool operator()(CrxUpdateItem* item) const { return item->id == id_; }
+
+   private:
+    const std::string& id_;
+  };
+};
+
+}  // namespace update_client
+
+#endif  // COMPONENTS_UPDATE_CLIENT_CRX_UPDATE_ITEM_H_