Added member data to classes to support download resumption.

content/browser/download/download_item.h

Index: content/browser/download/download_item.h
diff --git a/content/browser/download/download_item.h b/content/browser/download/download_item.h
index 3592d529f320dc5f903458dcc412b71c6e67385e..671985d94425a72ea894fd07be531758d631d771 100644
--- a/content/browser/download/download_item.h
+++ b/content/browser/download/download_item.h
@@ -124,8 +124,10 @@ class CONTENT_EXPORT DownloadItem {
   // Called when the user has validated the download of a dangerous file.
   virtual void DangerousDownloadValidated() = 0;
 
-  // Received a new chunk of data
-  virtual void Update(int64 bytes_so_far) = 0;
+  // Received a new chunk of data.
+  // |bytes_so_far| is the number of bytes received so far.
+  // |hash_state| is the current hash state.
+  virtual void Update(int64 bytes_so_far, const std::string& hash_state) = 0;
 
   // Cancel the download operation. We need to distinguish between cancels at
   // exit (DownloadManager destructor) from user interface initiated cancels
@@ -154,8 +156,11 @@ class CONTENT_EXPORT DownloadItem {
 
   // Download operation had an error.
   // |size| is the amount of data received at interruption.
+  // |hash_state| is the current hash state at interruption.
   // |reason| is the download interrupt reason code that the operation received.
-  virtual void Interrupted(int64 size, InterruptReason reason) = 0;
+  virtual void Interrupted(int64 size,
+                           const std::string& hash_state,
+                           InterruptReason reason) = 0;
 
   // Deletes the file from disk and removes the download from the views and
   // history.  |user| should be true if this is the result of the user clicking
@@ -240,6 +245,7 @@ class CONTENT_EXPORT DownloadItem {
   virtual int64 GetTotalBytes() const = 0;
   virtual void SetTotalBytes(int64 total_bytes) = 0;
   virtual int64 GetReceivedBytes() const = 0;
+  virtual const std::string& GetHashState() const = 0;
   virtual int32 GetId() const = 0;
   virtual DownloadId GetGlobalId() const = 0;
   virtual base::Time GetStartTime() const = 0;
@@ -268,6 +274,9 @@ class CONTENT_EXPORT DownloadItem {
   virtual void SetOpened(bool opened) = 0;
   virtual bool GetOpened() const = 0;
 
+  virtual const std::string& GetLastModifiedTime() const = 0;
+  virtual const std::string& GetETag() const = 0;
+
   virtual InterruptReason GetLastReason() const = 0;
   virtual DownloadPersistentStoreInfo GetPersistentStoreInfo() const = 0;
   virtual DownloadStateInfo GetStateInfo() const = 0;