[Resumption 7/11] Add a CanResume() method to DownloadItem.

content/public/browser/download_item.h

 // Copyright (c) 2012 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 140 matching lines @@
   virtual int32 GetId() const = 0;
   virtual DownloadId GetGlobalId() const = 0;
   virtual DownloadState GetState() const = 0;
 
   // Only valid if |GetState() == DownloadItem::INTERRUPTED|.
   virtual DownloadInterruptReason GetLastReason() const = 0;
 
   virtual bool IsPaused() const = 0;
   virtual bool IsTemporary() const = 0;
 
+  // Returns true if the download can be resumed. A download can be resumed if
+  // an in-progress download was paused or if an interrupted download requires
+  // user-interaction to resume.
+  virtual bool CanResume() const = 0;
+
   //    Convenience routines for accessing GetState() results conceptually -----
 
   // Returns true if the download needs more data.
   virtual bool IsPartialDownload() const = 0;
 
   // Returns true if the download is still receiving data.
   virtual bool IsInProgress() const = 0;
 
   // Returns true if the download has been cancelled or was interrupted.
   virtual bool IsCancelled() const = 0;
@@ skipping 149 matching lines @@
   // return |name|. Has no effect on the final target filename.
   virtual void SetDisplayName(const base::FilePath& name) = 0;
 
   // Debug/testing -------------------------------------------------------------
   virtual std::string DebugString(bool verbose) const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_ITEM_H_