Plumb through NetworkChangeNotifier::IsOffline() to WebKit, enabling

content/browser/tab_contents/tab_contents.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 "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/auto_reset.h"
 #include "base/metrics/histogram.h"
@@ skipping 379 matching lines @@
   }
 #endif
 
   // OnCloseStarted isn't called in unit tests.
   if (!tab_close_start_time_.is_null()) {
     UMA_HISTOGRAM_TIMES("Tab.Close",
         base::TimeTicks::Now() - tab_close_start_time_);
   }
 
   FOR_EACH_OBSERVER(TabContentsObserver, observers_, set_tab_contents(NULL));
+
+  net::NetworkChangeNotifier::RemoveOnlineStateObserver(this);
 }
 
 void TabContents::AddObservers() {
   printing_.reset(new printing::PrintViewManager(this));
   print_preview_.reset(new printing::PrintPreviewMessageHandler(this));
   fav_icon_helper_.reset(new FavIconHelper(this));
   autofill_manager_.reset(new AutoFillManager(this));
   autocomplete_history_manager_.reset(new AutocompleteHistoryManager(this));
   prerender_plt_recorder_.reset(new prerender::PrerenderPLTRecorder(this));
   desktop_notification_handler_.reset(
       new DesktopNotificationHandlerForTC(this, GetRenderProcessHost()));
   plugin_observer_.reset(new PluginObserver(this));
   safebrowsing_detection_host_.reset(new safe_browsing::ClientSideDetectionHost(
       this));
+  net::NetworkChangeNotifier::AddOnlineStateObserver(this);
 }
 
 bool TabContents::OnMessageReceived(const IPC::Message& message) {
   ObserverListBase<TabContentsObserver>::Iterator it(observers_);
   TabContentsObserver* observer;
   while ((observer = it.GetNext()) != NULL)
     if (observer->OnMessageReceived(message))
       return true;
 
   bool handled = true;
@@ skipping 2430 matching lines @@
 
 void TabContents::SwapInRenderViewHost(RenderViewHost* rvh) {
   render_manager_.SwapInRenderViewHost(rvh);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }
 
+void TabContents::OnOnlineStateChanged(bool online) {
+  render_view_host()->Send(new ViewMsg_NetworkStateChanged(
+      render_view_host()->routing_id(), online));
+}
+
 bool TabContents::MaybeUsePreloadedPage(const GURL& url) {
   prerender::PrerenderManager* pm = profile()->GetPrerenderManager();
   if (pm != NULL) {
     if (pm->MaybeUsePreloadedPage(this, url))
       return true;
   }
   return false;
 }