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

content/common/view_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 page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 573 matching lines @@
   IPC_STRUCT_MEMBER(std::string, state)
 
   // Type of navigation.
   IPC_STRUCT_MEMBER(ViewMsg_Navigate_Type::Value, navigation_type)
 
   // The time the request was created
   IPC_STRUCT_MEMBER(base::Time, request_time)
 
   // Extra headers (separated by \n) to send during the request.
   IPC_STRUCT_MEMBER(std::string, extra_headers)
+
+  // The following two members identify a previous request that has been
+  // created before this navigation is being 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()
 
 IPC_STRUCT_BEGIN(ViewMsg_New_Params)
   // The parent window's id.
   IPC_STRUCT_MEMBER(gfx::NativeViewId, parent_window)
 
   // Renderer-wide preferences.
   IPC_STRUCT_MEMBER(content::RendererPreferences, renderer_preferences)
 
   // Preferences for this view.
@@ skipping 1332 matching lines @@
                      media::MediaLogEvent /* event */)
 
 // Requests to lock the mouse. Will result in a ViewMsg_LockMouse_ACK message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_LockMouse)
 
 // Requests to unlock the mouse. A ViewMsg_MouseLockLost message will be sent
 // whenever the mouse is unlocked (which may or may not be caused by
 // ViewHostMsg_UnlockMouse).
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UnlockMouse)