Store the UploadData identifier in NavigationEntryImpl.

content/common/view_messages.h

 // Copyright (c) 2012 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 425 matching lines @@
   // Information regarding the security of the connection (empty if the
   // connection was not secure).
   IPC_STRUCT_MEMBER(std::string, security_info)
 
   // The gesture that initiated this navigation.
   IPC_STRUCT_MEMBER(NavigationGesture, gesture)
 
   // True if this was a post request.
   IPC_STRUCT_MEMBER(bool, is_post)
 
+  // The POST body identifier. -1 if it doesn't exist.

[cbentzel, 2012/02/01 22:02:13]

I considered removing the |is_post| field in favor of just the |post_id| field,
but was concerned that there may be cases where the method is "POST" but there
is no WebHistoryItem or httpBody attached to that item. See render_view_impl.cc
for that.

+  IPC_STRUCT_MEMBER(int64, post_id)
+
   // Whether the frame navigation resulted in no change to the documents within
   // the page. For example, the navigation may have just resulted in scrolling
   // to a named anchor.
   IPC_STRUCT_MEMBER(bool, was_within_same_page)
 
   // The status code of the HTTP request.
   IPC_STRUCT_MEMBER(int, http_status_code)
 
   // True if the connection was proxied.  In this case, socket_address
   // will represent the address of the proxy, rather than the remote host.
@@ skipping 1537 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)