Added member data to classes to support download resumption.

content/browser/download/download_file_impl.h

Index: content/browser/download/download_file_impl.h
diff --git a/content/browser/download/download_file_impl.h b/content/browser/download/download_file_impl.h
index 31073c5451139a7eb6ff3a649bf7bb7ed7925e51..63fdefdceea059197a5771bd257932687dd58233 100644
--- a/content/browser/download/download_file_impl.h
+++ b/content/browser/download/download_file_impl.h
@@ -39,6 +39,7 @@ class CONTENT_EXPORT DownloadFileImpl : virtual public DownloadFile {
   virtual bool InProgress() const OVERRIDE;
   virtual int64 BytesSoFar() const OVERRIDE;
   virtual bool GetSha256Hash(std::string* hash) OVERRIDE;
+  virtual std::string GetSha256HashState() OVERRIDE;

[Randy Smith (Not in Mondays), 2011/11/23 19:25:13]

It occurs to me to wonder--if the underlying implementation hides what type of
hash is actually being used from us, should we claim it's the Sha256 state? 
Should all of these functions just be Get/SetHashState?

   virtual void CancelDownloadRequest() OVERRIDE;
   virtual int Id() const OVERRIDE;
   virtual DownloadManager* GetDownloadManager() OVERRIDE;