Copy max_restored_page_id_ when needed.

content/browser/frame_host/navigation_controller_impl.cc

 // Copyright 2013 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.
 
 #include "content/browser/frame_host/navigation_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"  // Temporary
@@ skipping 1286 matching lines @@
   else
     max_source_index++;
 
   // Ignore the source's current entry if merging with replacement.
   // TODO(davidben): This should preserve entries forward of the current
   // too. http://crbug.com/317872
   if (replace_entry && max_source_index > 0)
     max_source_index--;
 
   InsertEntriesFrom(*source, max_source_index);
+  max_restored_page_id_ = source->max_restored_page_id_;

[Charlie Reis, 2014/04/24 18:02:02]

nit: Let's put this down near the CopyMaxPageIDsFrom call a few lines below,
since they're semantically related.

[Alexander Semashko, 2014/04/24 21:40:37]

Done.

 
   // Adjust indices such that the last entry and pending are at the end now.
   last_committed_entry_index_ = GetEntryCount() - 1;
 
   delegate_->SetHistoryLengthAndPrune(site_instance.get(),
                                       max_source_index,
                                       minimum_page_id);
 
   // Copy the max page id map from the old tab to the new tab.  This ensures
   // that new and existing navigations in the tab's current SiteInstances
@@ skipping 426 matching lines @@
     }
   }
 }
 
 void NavigationControllerImpl::SetGetTimestampCallbackForTest(
     const base::Callback<base::Time()>& get_timestamp_callback) {
   get_timestamp_callback_ = get_timestamp_callback;
 }
 
 }  // namespace content