WIP - Refactor programmatic downloads

content/public/browser/download_manager.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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 83 matching lines @@
    protected:
     virtual ~Observer() {}
   };
 
   typedef std::vector<DownloadItem*> DownloadVector;
 
   // Add all download items to |downloads|, no matter the type or state, without
   // clearing |downloads| first.
   virtual void GetAllDownloads(DownloadVector* downloads) = 0;
 
-  // Called by a download source (Currently DownloadResourceHandler)
-  // to initiate the non-source portions of a download.
-  // Returns the id assigned to the download.  If the DownloadCreateInfo
-  // specifies an id, that id will be used.
-  virtual void StartDownload(
-      scoped_ptr<DownloadCreateInfo> info,
-      scoped_ptr<ByteStreamReader> stream,
-      const DownloadUrlParameters::OnStartedCallback& on_started) = 0;
+  // Handles a download that's already in progress. The |request_handle|
+  // provides a handle for controlling the download. |info| specifies parameters
+  // for the new download including the ByteStreamReader.
+  virtual void StartDownloadWithActiveRequest(
+      scoped_ptr<DownloadRequestHandle> request_handle,
+      scoped_ptr<DownloadCreateInfo> info) = 0;
 
   // Remove downloads after remove_begin (inclusive) and before remove_end
   // (exclusive). You may pass in null Time values to do an unbounded delete
   // in either direction.
   virtual int RemoveDownloadsBetween(base::Time remove_begin,
                                      base::Time remove_end) = 0;
 
   // Remove downloads will delete all downloads that have a timestamp that is
   // the same or more recent than |remove_begin|. The number of downloads
   // deleted is returned back to the caller.
@@ skipping 44 matching lines @@
   virtual void CheckForHistoryFilesRemoval() = 0;
 
   // Get the download item for |id| if present, no matter what type of download
   // it is or state it's in.
   virtual DownloadItem* GetDownload(uint32 id) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_H_