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

chrome/browser/ui/webui/print_preview_ui.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_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_UI_H_
 #pragma once
 
 #include <string>
 
@@ skipping 18 matching lines @@
                                    scoped_refptr<RefCountedBytes>* data);
 
   // Sets the print preview |data|. |index| is zero-based, and can be
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to set the entire preview
   // document.
   void SetPrintPreviewDataForIndex(int index, const RefCountedBytes* data);
 
   // Clear the existing print preview data.
   void ClearAllPreviewData();
 
+  // Setters
+  void SetInitiatorTabURL(const std::string& initiator_url);
+
   // Notify the Web UI that there is a print preview request.
   // There should be a matching call to OnPreviewDataIsAvailable() or
   // OnPrintPreviewFailed().
   void OnPrintPreviewRequest();
 
   // Notify the Web UI that the print preview will have |page_count| pages.
   // |is_modifiable| indicates if the preview can be rerendered with different
   // print settings.
   void OnDidGetPreviewPageCount(int document_cookie_,
                                 int page_count,
@@ skipping 20 matching lines @@
   // Notify the Web UI that the print preview failed to render.
   void OnPrintPreviewFailed();
 
   // Notify the Web UI that the print preview request has been cancelled.
   void OnPrintPreviewCancelled();
 
   // Notify the Web UI that initiator tab is closed, so we can disable all
   // the controls that need the initiator tab for generating the preview data.
   // |initiator_tab_url| is passed in order to display a more accurate error
   // message.
-  void OnInitiatorTabClosed(const std::string& initiator_tab_url);
+  void OnInitiatorTabClosed();
+
+  // Notifies the Web UI that the initiator tab has crashed.
+  void OnInitiatorTabCrashed();
 
   // Notify the Web UI renderer that file selection has been cancelled.
   void OnFileSelectionCancelled();
 
   // Return true if there are pending requests.
   bool HasPendingRequests();
 
   int document_cookie();
 
  private:
   // Helper function
   PrintPreviewDataService* print_preview_data_service();
 
   void DecrementRequestCount();
 
   base::TimeTicks initial_preview_start_time_;
 
   // Store the PrintPreviewUI address string.
   std::string preview_ui_addr_str_;
 
   // Weak pointer to the WebUI handler.
   PrintPreviewHandler* handler_;
 
   // The number of print preview requests in flight.
   uint32 request_count_;
 
   // Document cookie from the initiator renderer.
   int document_cookie_;
 
+  // Store the |initiator_url| in order to display an accurate error message
+  // when the initiator tab is closed/crashed.
+  std::string initiator_url_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_UI_H_