Use extension to show activation message.

chrome/browser/renderer_host/offline_resource_handler.cc

 // Copyright (c) 2011 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/offline_resource_handler.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 82 matching lines @@
         NewRunnableMethod(this, &OfflineResourceHandler::ShowOfflinePage));
   }
 }
 
 bool OfflineResourceHandler::OnWillStart(int request_id,
                                          const GURL& url,
                                          bool* defer) {
   if (ShouldShowOfflinePage(url)) {
     deferred_request_id_ = request_id;
     deferred_url_ = url;
-    DVLOG(1) << "WillStart: this=" << this << ", request id=" << request_id;
+    DVLOG(1) << "OnWillStart: this=" << this << ", request id=" << request_id
+             << ", url=" << url;
     AddRef();  //  Balanced with OnCanHandleOfflineComplete
     DCHECK(!appcache_completion_callback_);
     appcache_completion_callback_ =
         new net::CancelableCompletionCallback<OfflineResourceHandler>(
             this, &OfflineResourceHandler::OnCanHandleOfflineComplete);
     ChromeURLRequestContext* url_request_context =
         static_cast<ChromeURLRequestContext*>(request_->context());
     url_request_context->appcache_service()->CanHandleMainResourceOffline(
         url, appcache_completion_callback_);
 
@@ skipping 68 matching lines @@
   DVLOG(1) << "Resume load: this=" << this << ", request id=" << request_id;
   next_handler_->OnWillStart(request_id, url, &defer);
   if (!defer)
     rdh_->StartDeferredRequest(process_host_id_, request_id);
 }
 
 void OfflineResourceHandler::ShowOfflinePage() {
   chromeos::OfflineLoadPage::Show(
       process_host_id_, render_view_id_, deferred_url_, this);
 }