Be able to print items that do window.print(); window.close() (airline tix e.g.)

chrome/browser/printing/print_preview_tab_controller.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/printing/print_preview_tab_controller.h"
 
 #include "base/command_line.h"
+#include "base/debug/stack_trace.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/printing/background_printing_manager.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/print_preview_ui.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "content/browser/tab_contents/navigation_details.h"
@@ skipping 111 matching lines @@
     if (source_tab_is_preview_tab &&
         transition_type == PageTransition::FORWARD_BACK &&
         nav_type == NavigationType::EXISTING_PAGE) {
       return;
     }
   }
 
   if (source_tab_is_preview_tab) {
     // Remove the initiator tab's observers before erasing the mapping.
     TabContents* initiator_tab = GetInitiatorTab(source_tab);
-    if (initiator_tab)
+    if (initiator_tab) {
       RemoveObservers(initiator_tab);
+      TabContentsWrapper* initiator_wrapper =
+          TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
+      g_browser_process->background_printing_manager()->
+          ReleaseInitiatorTabContents(initiator_wrapper);
+    }
 
     // |source_tab_is_preview_tab| is misleading in the case where the user
     // chooses to re-open the initiator tab after closing it, as |source_tab|
     // has navigated to the URL of the initiator tab at this point. Make sure to
     // verify that |source_tab| really is a print preview tab.
     if (IsPrintPreviewTab(source_tab) && source_tab->web_ui()) {
       PrintPreviewUI* print_preview_ui =
           static_cast<PrintPreviewUI*>(source_tab->web_ui());
       print_preview_ui->OnNavigation();
     }
 
     // Erase the map entry.
+    DLOG(INFO) << "erasing " << (void*)source_tab;
     preview_tab_map_.erase(source_tab);
   } else {
     // Initiator tab is closed. Disable the controls in preview tab.
     PrintPreviewUI* print_preview_ui =
         static_cast<PrintPreviewUI*>(preview_tab->web_ui());
     print_preview_ui->OnInitiatorTabClosed(source_tab->GetURL().spec());
 
     // |source_tab| is an initiator tab, update the map entry.
+    DLOG(INFO) << "initiator tab closed; NULLING " << (void*)preview_tab;
     preview_tab_map_[preview_tab] = NULL;
   }
   RemoveObservers(source_tab);
 }
 
 // static
 bool PrintPreviewTabController::IsPrintPreviewTab(TabContents* tab) {
   const GURL& url = tab->GetURL();
   return (url.SchemeIs(chrome::kChromeUIScheme) &&
           url.host() == chrome::kChromeUIPrintHost);
 }
 
 void PrintPreviewTabController::EraseInitiatorTabInfo(
     TabContents* preview_tab) {
   PrintPreviewTabMap::iterator it = preview_tab_map_.find(preview_tab);
   if (it == preview_tab_map_.end())
     return;
 
   RemoveObservers(it->second);
+  DLOG(INFO) << __FUNCTION__ << ' ' << (void*)preview_tab;
+  base::debug::StackTrace().PrintBacktrace();
   preview_tab_map_[preview_tab] = NULL;
 }
 
 TabContents* PrintPreviewTabController::GetInitiatorTab(
     TabContents* preview_tab) {
   PrintPreviewTabMap::iterator it = preview_tab_map_.find(preview_tab);
   if (it != preview_tab_map_.end())
     return preview_tab_map_[preview_tab];
   return NULL;
 }
@@ skipping 51 matching lines @@
 }
 
 void PrintPreviewTabController::RemoveObservers(TabContents* tab) {
   registrar_.Remove(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
                     Source<TabContents>(tab));
   registrar_.Remove(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
                     Source<NavigationController>(&tab->controller()));
 }
 
 }  // namespace printing