Download resumption - Preliminary

content/public/browser/download_manager_delegate.h

Index: content/public/browser/download_manager_delegate.h
diff --git a/content/public/browser/download_manager_delegate.h b/content/public/browser/download_manager_delegate.h
index 7c7d85c3310b01536730d919e6f83384b0fedbc8..5d948c65e0f61d9a12007de3835266565e207640 100644
--- a/content/public/browser/download_manager_delegate.h
+++ b/content/public/browser/download_manager_delegate.h
@@ -74,6 +74,12 @@ class CONTENT_EXPORT DownloadManagerDelegate {
   virtual bool DetermineDownloadTarget(DownloadItem* item,
                                        const DownloadTargetCallback& callback);
 
+  // Gets the intermediate file's length.
+  // |path| is the final name of the file, unless |temporary| is true, in which
+  // case |path| is the temporary file name.
+  virtual int64 GetIntermediateFileLength(const FilePath& path,
+                                          bool temporary);
+
   // Called when the download system wants to alert a WebContents that a
   // download has started, but the TabConetnts has gone away. This lets an
   // delegate return an alternative WebContents. The delegate can return NULL.