re-use WebUIs

chrome/browser/ui/webui/net_internals/net_internals_ui.cc

 // Copyright (c) 2012 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/ui/webui/net_internals/net_internals_ui.h"
 
 #include <algorithm>
 #include <list>
 #include <string>
 #include <utility>
@@ skipping 870 matching lines @@
 }
 
 void NetInternalsMessageHandler::IOThreadImpl::OnWebUIDeleted() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   was_webui_deleted_ = true;
 }
 
 void NetInternalsMessageHandler::IOThreadImpl::OnRendererReady(
     const ListValue* list) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-  DCHECK(!net_log()) << "notifyReady called twice";
 
   SendJavascriptCommand("receivedConstants",
                         NetInternalsUI::GetConstants());
 
-  // Register with network stack to observe events.
-  io_thread_->net_log()->AddThreadSafeObserver(this,
-                                               net::NetLog::LOG_ALL_BUT_BYTES);
+  if (!net_log()) {
+    // Register with network stack to observe events.
+    io_thread_->net_log()->AddThreadSafeObserver(this,
+        net::NetLog::LOG_ALL_BUT_BYTES);
+  }
 }
 
 void NetInternalsMessageHandler::IOThreadImpl::OnGetProxySettings(
     const ListValue* list) {
   net::URLRequestContext* context = context_getter_->GetURLRequestContext();
   net::ProxyService* proxy_service = context->proxy_service();
 
   DictionaryValue* dict = new DictionaryValue();
   if (proxy_service->fetched_config().is_valid())
     dict->Set("original", proxy_service->fetched_config().ToValue());
@@ skipping 814 matching lines @@
 
 NetInternalsUI::NetInternalsUI(content::WebUI* web_ui)
     : WebUIController(web_ui) {
   web_ui->AddMessageHandler(new NetInternalsMessageHandler());
 
   // Set up the chrome://net-internals/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   profile->GetChromeURLDataManager()->AddDataSource(
       CreateNetInternalsHTMLSource());
 }