Initial CL for Downloads resumption.

content/browser/download/download_resource_handler.h

Index: content/browser/download/download_resource_handler.h
diff --git a/content/browser/download/download_resource_handler.h b/content/browser/download/download_resource_handler.h
index f40996453aca4d665c0aa64c169d52deedb7eb54..7eac1e6bdc91e15d94cbb8cb43e16caf485689d9 100644
--- a/content/browser/download/download_resource_handler.h
+++ b/content/browser/download/download_resource_handler.h
@@ -37,7 +37,9 @@ class DownloadResourceHandler
   typedef DownloadUrlParameters::OnStartedCallback OnStartedCallback;
 
   // started_cb will be called exactly once on the UI thread.
+  // |id| should be invalid if the id should be automatically assigned.
   DownloadResourceHandler(
+      DownloadId id,
       net::URLRequest* request,
       const OnStartedCallback& started_cb,
       scoped_ptr<DownloadSaveInfo> save_info);
@@ -100,6 +102,7 @@ class DownloadResourceHandler
 
   void SetContentDisposition(const std::string& content_disposition);
 
+  DownloadId download_id_;
   GlobalRequestID global_id_;
   int render_view_id_;
   std::string content_disposition_;