Persist offline page info in a navigation entry if needed

content/browser/frame_host/navigation_entry_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_entry_impl.h"
 
 #include <stddef.h>
 
 #include <queue>
 #include <utility>
@@ skipping 541 matching lines @@
 }
 
 const std::vector<GURL>& NavigationEntryImpl::GetRedirectChain() const {
   return redirect_chain_;
 }
 
 bool NavigationEntryImpl::IsRestored() const {
   return restore_type_ != RestoreType::NONE;
 }
 
+std::string NavigationEntryImpl::GetExtraHeaders() const {
+  return extra_headers_;
+}
+
+void NavigationEntryImpl::AddExtraHeaders(
+    const std::string& more_extra_headers) {
+  DCHECK(!more_extra_headers.empty());
+  if (!extra_headers_.empty())
+    extra_headers_ += "\r\n";
+  extra_headers_ += more_extra_headers;
+}
+
 void NavigationEntryImpl::SetCanLoadLocalResources(bool allow) {
   can_load_local_resources_ = allow;
 }
 
 bool NavigationEntryImpl::GetCanLoadLocalResources() const {
   return can_load_local_resources_;
 }
 
 void NavigationEntryImpl::SetExtraData(const std::string& key,
                                        const base::string16& data) {
@@ skipping 334 matching lines @@
       return node;
 
     // Enqueue any children and keep looking.
     for (auto* child : node->children)
       work_queue.push(child);
   }
   return nullptr;
 }
 
 }  // namespace content