Fix a bug where redirect chain gets lost on process swap.

content/common/resource_messages.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for resource loading.
 
 // Multiply-included message file, hence no include guard.
 #include "base/shared_memory.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/resource_response.h"
@@ skipping 93 matching lines @@
   IPC_STRUCT_MEMBER(int64, frame_id)
 
   // True if |parent_frame_id| is the main frame of a RenderView.
   IPC_STRUCT_MEMBER(bool, parent_is_main_frame)
 
   // Identifies the parent frame of the frame that sent the request.
   // -1 if unknown / invalid.
   IPC_STRUCT_MEMBER(int64, parent_frame_id)
 
   IPC_STRUCT_MEMBER(content::PageTransition, transition_type)
+
+  // The following two members identify a previous request that has been
+  // created before this navigation has been transferred to a new render view.
+  // This serves the purpose of recycling the old request.
+  // Unless this refers to a transferred navigation, these values are -1 and -1.
+  IPC_STRUCT_MEMBER(int, transferred_request_child_id)
+  IPC_STRUCT_MEMBER(int, transferred_request_request_id)
 IPC_STRUCT_END()
 
 // Resource messages sent from the browser to the renderer.
 
 // Sent when the headers are available for a resource request.
 IPC_MESSAGE_ROUTED2(ResourceMsg_ReceivedResponse,
                     int /* request_id */,
                     content::ResourceResponseHead)
 
 // Sent when cached metadata from a resource request is ready.
@@ skipping 78 matching lines @@
                     int /* request_id */)
 
 // Sent by the renderer process to acknowledge receipt of a
 // UploadProgress message.
 IPC_MESSAGE_ROUTED1(ResourceHostMsg_UploadProgress_ACK,
                     int /* request_id */)
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)