Initial CL for Downloads resumption.

content/public/browser/resource_dispatcher_host.h

Index: content/public/browser/resource_dispatcher_host.h
diff --git a/content/public/browser/resource_dispatcher_host.h b/content/public/browser/resource_dispatcher_host.h
index 5762d4f36510d114a32d7146c7ecd270d71d12db..512d5450acc28138d7f6b091ff8b030b1cddd7fc 100644
--- a/content/public/browser/resource_dispatcher_host.h
+++ b/content/public/browser/resource_dispatcher_host.h
@@ -6,6 +6,7 @@
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_DISPATCHER_HOST_H_
 
 #include "base/callback_forward.h"
+#include "content/public/browser/download_id.h"
 #include "net/base/net_errors.h"
 
 namespace net {
@@ -49,6 +50,9 @@ class CONTENT_EXPORT ResourceDispatcherHost {
       int route_id,
       bool prefer_cache,
       scoped_ptr<DownloadSaveInfo> save_info,
+      const std::string& last_modified,
+      const std::string& etag,
+      content::DownloadId download_id,
       const DownloadStartedCallback& started_callback) = 0;
 
   // Clears the ResourceDispatcherHostLoginDelegate associated with the request.