Print Preview: Properly handle window.print().

chrome/browser/printing/print_preview_message_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/printing/print_preview_message_handler.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/shared_memory.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/print_job_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
+#include "chrome/browser/printing/print_view_manager.h"
 #include "chrome/browser/printing/printer_query.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/print_preview_ui.h"
 #include "chrome/common/print_messages.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/browser_thread.h"
 #include "printing/page_size_margins.h"
 #include "printing/print_job_constants.h"
 
@@ skipping 225 matching lines @@
     const GURL& url,
     NavigationController::ReloadType reload_type) {
   TabContentsWrapper* tab = tab_contents_wrapper();
   TabContentsWrapper* preview_tab = GetPrintPreviewTab();
   if (tab == preview_tab) {
     // Cloud print sign-in reloads the page.
     DCHECK(PrintPreviewTabController::IsPrintPreviewURL(url));
     DCHECK_EQ(NavigationController::RELOAD, reload_type);
     return;
   }
+  // If |tab| is navigating and it has a print preview tab, notify |tab| to
+  // consider print preview done so it unfreezes the renderer in the case of
+  // window.print().
+  if (preview_tab)
+    tab->print_view_manager()->PrintPreviewDone();
 }
 
 }  // namespace printing