Propagate server response error and interrupt the download.

content/browser/download/download_worker.h

Index: content/browser/download/download_worker.h
diff --git a/content/browser/download/download_worker.h b/content/browser/download/download_worker.h
index 75a7f96c04d2a70b3160ad678d59be91b83445dc..2206617b52f362e9719e05a4ed5aca263ea2e829 100644
--- a/content/browser/download/download_worker.h
+++ b/content/browser/download/download_worker.h
@@ -23,9 +23,21 @@ namespace content {
 // download.
 class DownloadWorker : public UrlDownloader::Delegate {
  public:
-  DownloadWorker();
+  class Delegate {
+   public:
+    // Called when there is an error caused by the server response.
+    virtual void OnServerResponseError(DownloadWorker* worker,
+                                       DownloadInterruptReason reason) = 0;
+  };
+
+  DownloadWorker(DownloadWorker::Delegate* delegate,
+                 int64_t offset,
+                 int64_t length);
   virtual ~DownloadWorker();
 
+  int64_t offset() const { return offset_; }
+  int64_t length() const { return length_; }
+
   // Send network request to ask for a download.
   void SendRequest(std::unique_ptr<DownloadUrlParameters> params);
 
@@ -46,6 +58,14 @@ class DownloadWorker : public UrlDownloader::Delegate {
       std::unique_ptr<UrlDownloader, BrowserThread::DeleteOnIOThread>
           downloader);
 
+  DownloadWorker::Delegate* const delegate_;
+
+  // The starting position of the content for this worker to download.
+  int64_t offset_;
+
+  // The length of the request. May be 0 to fetch to the end of the file.
+  int64_t length_;
+
   // Used to control the network request. Live on UI thread.
   std::unique_ptr<DownloadRequestHandleInterface> request_handle_;