Print Preview: Display a throbber when the user requests the system print

chrome/browser/automation/testing_automation_provider.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/automation/testing_automation_provider.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 1458 matching lines @@
   NavigationController* tab = NULL;
   TabContents* tab_contents = GetTabContentsForHandle(tab_handle, &tab);
   if (tab_contents) {
     FindAndActivateTab(tab);
 
     NotificationObserver* observer =
         new DocumentPrintedNotificationObserver(this, reply_message);
 
     TabContentsWrapper* wrapper =
         TabContentsWrapper::GetCurrentWrapperForContents(tab_contents);
-    if (!wrapper->print_view_manager()->PrintNow()) {
+    if (!wrapper->print_view_manager()->PrintNow(NULL)) {
       // Clean up the observer. It will send the reply message.
       delete observer;
     }
 
     // Return now to avoid sending reply message twice.
     return;
   }
 
   AutomationMsg_PrintNow::WriteReplyParams(reply_message, false);
   Send(reply_message);
@@ skipping 4420 matching lines @@
   IPC::ParamTraits<std::vector<GURL> >::Write(reply_message_, redirects_gurl);
 
   Send(reply_message_);
   redirect_query_ = 0;
   reply_message_ = NULL;
 }
 
 void TestingAutomationProvider::OnRemoveProvider() {
   AutomationProviderList::GetInstance()->RemoveProvider(this);
 }