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 3d3b0e7ace3a8b7454f1f7cc31088b3a2c5cc6e7..ab911d3253f92e0261f4eb491900836c7faab61f 100644
--- a/content/browser/download/download_item.h
+++ b/content/browser/download/download_item.h
@@ -163,8 +163,11 @@ class CONTENT_EXPORT DownloadItem {
   // Called when the user has validated the download of a dangerous file.
   void DangerousDownloadValidated();
 
-  // Received a new chunk of data
-  void Update(int64 bytes_so_far);
+  // Received a new chunk of data.
+  // |bytes_so_far| is the number of bytes received so far.
+  // |partial_hash| is the hash up to this point.  It will be an empty string
+  // if we are not calculating hashes.
+  void Update(int64 bytes_so_far, const std::string& partial_hash);
 
   // Cancel the download operation. We need to distinguish between cancels at
   // exit (DownloadManager destructor) from user interface initiated cancels
@@ -193,8 +196,11 @@ class CONTENT_EXPORT DownloadItem {
 
   // Download operation had an error.
   // |size| is the amount of data received at interruption.
+  // |partial_hash| is the current hash value at interruption.
   // |reason| is the download interrupt reason code that the operation received.
-  void Interrupted(int64 size, InterruptReason reason);
+  void Interrupted(int64 size,
+                   const std::string partial_hash,
+                   InterruptReason reason);
 
   // 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
@@ -313,6 +319,9 @@ class CONTENT_EXPORT DownloadItem {
   void set_opened(bool opened) { opened_ = opened; }
   bool opened() const { return opened_; }
 
+  const std::string& last_modified_time() const { return last_modified_time_; }
+  const std::string& etag() const { return etag_; }
+
   InterruptReason last_reason() const { return last_reason_; }
 
   DownloadPersistentStoreInfo GetPersistentStoreInfo() const;
@@ -354,8 +363,9 @@ class CONTENT_EXPORT DownloadItem {
   // downloads and false for downloads from the history.
   void Init(bool active);
 
-  // Internal helper for maintaining consistent received and total sizes.
-  void UpdateSize(int64 size);
+  // Internal helper for maintaining consistent received and total sizes, and
+  // hash.
+  void UpdateSizeAndHash(int64 size, const std::string& partial_hash);
 
   // Called when the entire download operation (including renaming etc)
   // is completed.
@@ -417,42 +427,48 @@ class CONTENT_EXPORT DownloadItem {
   // It's used to construct a suggested filename.
   std::string referrer_charset_;
 
-  // Total bytes expected
+  // Total bytes expected.
   int64 total_bytes_;
 
-  // Current received bytes
+  // Current received bytes.
   int64 received_bytes_;
 
   // Sha256 hash of the content.  This might be empty either because
-  // the download isn't done yet or because the hash isn't needed
+  // the download hasn't started yet or because the hash isn't needed
   // (ChromeDownloadManagerDelegate::GenerateFileHash() returned false).
   std::string hash_;
 
+  // Server's time stamp for the file.
+  std::string last_modified_time_;
+
+  // Server's ETAG for the file.
+  std::string etag_;
+
   // Last reason.
   InterruptReason last_reason_;
 
-  // Start time for calculating remaining time
+  // Start time for calculating remaining time.
   base::TimeTicks start_tick_;
 
-  // The current state of this download
+  // The current state of this download.
   DownloadState state_;
 
-  // The views of this item in the download shelf and download tab
+  // The views of this item in the download shelf and download tab.
   ObserverList<Observer> observers_;
 
-  // Time the download was started
+  // Time the download was started.
   base::Time start_time_;
 
-  // Time the download completed
+  // Time the download completed.
   base::Time end_time_;
 
-  // Our persistent store handle
+  // Our persistent store handle.
   int64 db_handle_;
 
-  // Our owning object
+  // Our owning object.
   DownloadManager* download_manager_;
 
-  // In progress downloads may be paused by the user, we note it here
+  // In progress downloads may be paused by the user, we note it here.
   bool is_paused_;
 
   // A flag for indicating if the download should be opened at completion.