Detect removed files and reflect the state in chrome://downloads and the download shelf

chrome/browser/download/download_item.h

 // Copyright (c) 2011 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.
 //
 // Each download is represented by a DownloadItem, and all DownloadItems
 // are owned by the DownloadManager which maintains a global list of all
 // downloads. DownloadItems are created when a user initiates a download,
 // and exist for the duration of the browser life time.
 //
 // Download observers:
@@ skipping 139 matching lines @@
   // exit (DownloadManager destructor) from user interface initiated cancels
   // because at exit, the history system may not exist, and any updates to it
   // require AddRef'ing the DownloadManager in the destructor which results in
   // a DCHECK failure. Set 'update_history' to false when canceling from at
   // exit to prevent this crash. This may result in a difference between the
   // downloaded file's size on disk, and what the history system's last record
   // of it is. At worst, we'll end up re-downloading a small portion of the file
   // when resuming a download (assuming the server supports byte ranges).
   void Cancel(bool update_history);
 
-  // Called when all data has been saved.  Only has display effects.
-  void OnAllDataSaved(int64 size);
-
   // Called by external code (SavePackage) using the DownloadItem interface
   // to display progress when the DownloadItem should be considered complete.
   void MarkAsComplete();
 
+  // Called when all data has been saved. Only has display effects.
+  void OnAllDataSaved(int64 size);
+
+  // Called when the downloaded file is removed.
+  void OnDownloadedFileRemoved();
+
   // Download operation had an error.
   // |size| is the amount of data received so far, and |os_error| is the error
   // code that the operation received.
   void Interrupted(int64 size, int os_error);
 
   // Deletes the file from disk and removes the download from the views and
   // history.  |user| should be true if this is the result of the user clicking
   // the discard button, and false if it is being deleted for other reasons like
   // browser shutdown.
   void Delete(DeleteReason reason);
@@ skipping 74 matching lines @@
   int64 total_bytes() const { return total_bytes_; }
   void set_total_bytes(int64 total_bytes) { total_bytes_ = total_bytes; }
   int64 received_bytes() const { return received_bytes_; }
   int32 id() const { return id_; }
   base::Time start_time() const { return start_time_; }
   void set_db_handle(int64 handle) { db_handle_ = handle; }
   int64 db_handle() const { return db_handle_; }
   bool is_paused() const { return is_paused_; }
   bool open_when_complete() const { return open_when_complete_; }
   void set_open_when_complete(bool open) { open_when_complete_ = open; }
+  bool file_externally_removed() const { return file_externally_removed_; }
   SafetyState safety_state() const { return safety_state_; }
   void set_safety_state(SafetyState safety_state) {
     safety_state_ = safety_state;
   }
   DangerType danger_type() { return danger_type_;}
   bool auto_opened() { return auto_opened_; }
   FilePath target_name() const { return target_name_; }
   bool save_as() const { return save_as_; }
   bool is_otr() const { return is_otr_; }
   bool is_extension_install() const { return is_extension_install_; }
@@ skipping 90 matching lines @@
 
   // Our owning object
   DownloadManager* download_manager_;
 
   // In progress downloads may be paused by the user, we note it here
   bool is_paused_;
 
   // A flag for indicating if the download should be opened at completion.
   bool open_when_complete_;
 
+  // A flag for indicating if the downloaded file is externally removed.
+  bool file_externally_removed_;
+
   // Whether the download is considered potentially safe or dangerous
   // (executable files are typically considered dangerous).
   SafetyState safety_state_;
 
   // Why |safety_state_| is not SAFE.
   DangerType danger_type_;
 
   // Whether the download was auto-opened. We set this rather than using
   // an observer as it's frequently possible for the download to be auto opened
   // before the observer is added.
@@ skipping 26 matching lines @@
   // Did the user open the item either directly or indirectly (such as by
   // setting always open files of this type)? The shelf also sets this field
   // when the user closes the shelf before the item has been opened but should
   // be treated as though the user opened it.
   bool opened_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItem);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_H_