Added member data to classes to support download resumption.

content/browser/download/download_file.h

Index: content/browser/download/download_file.h
diff --git a/content/browser/download/download_file.h b/content/browser/download/download_file.h
index dbba1ddd3c0975445c27f4c4a5a359b52ede48f6..08aa3db662231e6f307d8b540a1518e01e4196b2 100644
--- a/content/browser/download/download_file.h
+++ b/content/browser/download/download_file.h
@@ -57,6 +57,12 @@ class CONTENT_EXPORT DownloadFile {
   // Returns true if digest is successfully calculated.
   virtual bool GetSha256Hash(std::string* hash) = 0;
 
+  // Returns the current (intermediate) state of the hash as a byte string.
+  virtual std::string GetSha256HashState() = 0;
+
+  // Resets the current state of the hash to the contents of |hash_state|.
+  virtual bool SetSha256HashState(const std::string& hash_state) = 0;

[Randy Smith (Not in Mondays), 2011/11/22 17:37:49]

Same comment as in base file; can we get rid of this setter?

[ahendrickson, 2011/11/22 23:46:44]

This one we can get rid of.

Done.

+
   // Cancels the download request associated with this file.
   virtual void CancelDownloadRequest() = 0;