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 fc3e0299f50d75cf9fe593ccd0031fca756580ce..25d976ec6ac5044d36b90e1df85c0d6b994279d2 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);
@@ -97,6 +99,7 @@ class DownloadResourceHandler
 
   void SetContentDisposition(const std::string& content_disposition);
 
+  DownloadId download_id_;
   GlobalRequestID global_id_;
   int render_view_id_;
   std::string content_disposition_;