PrintPreview: Preview generation should not block print button.

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 "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 38 matching lines @@
   void HandleGetPrinters(const ListValue* args);
 
   // Ask the initiator renderer to generate a preview.
   // First element of |args| is a job settings JSON string.
   void HandleGetPreview(const ListValue* args);
 
   // Get the job settings from Web UI and initiate printing.
   // First element of |args| is a job settings JSON string.
   void HandlePrint(const ListValue* args);
 
+  // Handles the request to hide the preview tab for printing.
+  // |args| is unused.
+  void HandleHidePreview(const ListValue* args);
+
   // Get the printer capabilities.
   // First element of |args| is the printer name.
   void HandleGetPrinterCapabilities(const ListValue* args);
 
   // Ask the initiator renderer to show the native print system dialog.
   // |args| is unused.
   void HandleShowSystemDialog(const ListValue* args);
 
   // Ask the browser to show the native printer management dialog.
   // |args| is unused.
@@ skipping 18 matching lines @@
 
   // Helper function to close the print preview tab.
   void ClosePrintPreviewTab();
 
   // Helper function to activate the initiator tab and close the preview tab.
   void ActivateInitiatorTabAndClosePreviewTab();
 
   // Adds all the recorded stats taken so far to histogram counts.
   void ReportStats();
 
+  // Helper function to hide the preview tab for printing.
+  void HidePreviewTab();
+
+  // Helper function to clear initiator tab details for this preview tab.
+  void ClearInitiatorTabDetails();
+
   // Pointer to current print system.
   scoped_refptr<printing::PrintBackend> print_backend_;
 
   // The underlying dialog object.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   static FilePath* last_saved_path_;
   static std::string* last_used_printer_;
 
   // A count of how many requests received to regenerate preview data.
   // Initialized to 0 then incremented and emitted to a histogram.
   int regenerate_preview_request_count_;
 
   // A count of how many requests received to show manage printers dialog.
   int manage_printers_dialog_request_count_;
 
   // 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_