Print Preview: Handle a crashed initiator tab by showing a message in PP.

chrome/browser/ui/webui/print_preview_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 32 matching lines @@
                             int index,
                             void* params) OVERRIDE;
   virtual void FileSelectionCanceled(void* params) OVERRIDE;
 
   // PrintViewManagerObserver implementation.
   virtual void OnPrintDialogShown() OVERRIDE;
 
   // Displays a modal dialog, prompting the user to select a file.
   void SelectFile(const FilePath& default_path);
 
-  // Called when the print preview tab navigates. This is the last time this
+  // Called when the print preview tab is destroyed. This is the last time
   // this object has access to the PrintViewManager in order to disconnect the
   // observer.
-  void OnNavigation();
+  void OnTabDestroyed();
 
  private:
   friend class PrintSystemTaskProxy;
 
   TabContents* preview_tab();
 
   // Gets the default printer. |args| is unused.
   void HandleGetDefaultPrinter(const base::ListValue* args);
 
   // Gets the list of printers. |args| is unused.
@@ skipping 23 matching lines @@
   void HandleGetPrinterCapabilities(const base::ListValue* args);
 
   // Asks the initiator renderer to show the native print system dialog. |args|
   // is unused.
   void HandleShowSystemDialog(const base::ListValue* args);
 
   // Brings up a web page to allow the user to configure cloud print.
   // |args| is unused.
   void HandleManageCloudPrint(const base::ListValue* args);
 
+  // Reloads the initiator tab and closes the associated preview tab. |args| is
+  // unused.
+  void HandleReloadCrashedInitiatorTab(const base::ListValue* args);
+
   // Asks the browser to show the native printer management dialog.
   // |args| is unused.
   void HandleManagePrinters(const base::ListValue* args);
 
   // Asks the browser to close the preview tab. |args| is unused.
   void HandleClosePreviewTab(const base::ListValue* args);
 
   // Sends the printer capabilities to the Web UI. |settings_info| contains
   // printer capabilities information.
   void SendPrinterCapabilities(const base::DictionaryValue& settings_info);
@@ skipping 51 matching lines @@
   // Whether we have already logged a failed print preview.
   bool reported_failed_preview_;
 
   // Whether we have already logged the number of printers this session.
   bool has_logged_printers_count_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HANDLER_H_