Show offline interstitial page when offline and reload when reconnected to network.

chrome/browser/renderer_host/resource_queue.cc

 // Copyright (c) 2009 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 "chrome/browser/renderer_host/resource_queue.h"
 
 #include "base/stl_util-inl.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/renderer_host/global_request_id.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host_request_info.h"
@@ skipping 27 matching lines @@
 
 void ResourceQueue::AddRequest(
     URLRequest* request,
     const ResourceDispatcherHostRequestInfo& request_info) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
   DCHECK(!shutdown_);
 
   GlobalRequestID request_id(request_info.child_id(),
                              request_info.request_id());
 
-  DCHECK(!ContainsKey(requests_, request_id));
+  DCHECK(!ContainsKey(requests_, request_id))
+      << "child_id:" << request_info.child_id()
+      << ", request_id:" << request_info.request_id();
   requests_[request_id] = request;
 
   DelegateSet interested_delegates;
 
   for (DelegateSet::iterator i = delegates_.begin();
        i != delegates_.end(); ++i) {
     if ((*i)->ShouldDelayRequest(request, request_info, request_id))
       interested_delegates.insert(*i);
   }
 
@@ skipping 23 matching lines @@
     interested_delegates_.erase(request_id);
 
     if (ContainsKey(requests_, request_id)) {
       URLRequest* request = requests_[request_id];
       // The request shouldn't have started (SUCCESS is the initial state).
       DCHECK_EQ(URLRequestStatus::SUCCESS, request->status().status());
       request->Start();
     }
   }
 }