Send session history offset and length parameters in the Navigate message to...

chrome/common/render_messages.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_COMMON_RENDER_MESSAGES_H_
 #define CHROME_COMMON_RENDER_MESSAGES_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 67 matching lines @@
     // Navigation type not categorized by the other types.
     NORMAL
   };
 
   // The page_id for this navigation, or -1 if it is a new navigation.  Back,
   // Forward, and Reload navigations should have a valid page_id.  If the load
   // succeeds, then this page_id will be reflected in the resultant
   // ViewHostMsg_FrameNavigate message.
   int32 page_id;
 
+  // If page_id is -1, then pending_history_list_offset will also be -1.
+  // Otherwise, it contains the offset into the history list corresponding to
+  // the current navigation.
+  int pending_history_list_offset;
+
+  // Informs the RenderView of where its current page contents reside in
+  // session history and the total size of the session history list.
+  int current_history_list_offset;
+  int current_history_list_length;
+
   // The URL to load.
   GURL url;
 
   // The URL to send in the "Referer" header field. Can be empty if there is
   // no referrer.
   GURL referrer;
 
   // The type of transition.
   PageTransition::Type transition;
 
@@ skipping 705 matching lines @@
     LogParam(control, l);
   }
 };
 
 // Traits for ViewMsg_Navigate_Params structure to pack/unpack.
 template <>
 struct ParamTraits<ViewMsg_Navigate_Params> {
   typedef ViewMsg_Navigate_Params param_type;
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, p.page_id);
+    WriteParam(m, p.pending_history_list_offset);
+    WriteParam(m, p.current_history_list_offset);
+    WriteParam(m, p.current_history_list_length);
     WriteParam(m, p.url);
     WriteParam(m, p.referrer);
     WriteParam(m, p.transition);
     WriteParam(m, p.state);
     WriteParam(m, p.navigation_type);
     WriteParam(m, p.request_time);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
     return
       ReadParam(m, iter, &p->page_id) &&
+      ReadParam(m, iter, &p->pending_history_list_offset) &&
+      ReadParam(m, iter, &p->current_history_list_offset) &&
+      ReadParam(m, iter, &p->current_history_list_length) &&
       ReadParam(m, iter, &p->url) &&
       ReadParam(m, iter, &p->referrer) &&
       ReadParam(m, iter, &p->transition) &&
       ReadParam(m, iter, &p->state) &&
       ReadParam(m, iter, &p->navigation_type) &&
       ReadParam(m, iter, &p->request_time);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"(");
     LogParam(p.page_id, l);
@@ skipping 1818 matching lines @@
   }
 };
 
 }  // namespace IPC
 
 
 #define MESSAGES_INTERNAL_FILE "chrome/common/render_messages_internal.h"
 #include "ipc/ipc_message_macros.h"
 
 #endif  // CHROME_COMMON_RENDER_MESSAGES_H_