Add support for starting an extension print job to print preview

chrome/browser/ui/webui/print_preview/print_preview_handler.h

 // Copyright (c) 2012 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_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 285 matching lines @@
   void OnGotPrintersForExtension(const base::ListValue& printers, bool done);
 
   // Called when an extension reports the set of print capabilites for a
   // printer.
   // |printer_id|: The id of the printer whose capabilities are reported.
   // |capabilities|: The printer capabilities.
   void OnGotExtensionPrinterCapabilities(
       const std::string& printer_id,
       const base::DictionaryValue& capabilities);
 
+  // Called when an extension print job is completed.
+  // |success|: Whether the job succeeded.
+  // |status|: The returned print job status. Useful for reporting a specific
+  //     error.
+  void OnExtensionPrintResult(bool success, const std::string& status);
+
   // Register/unregister from notifications of changes done to the GAIA
   // cookie.
   void RegisterForMergeSession();
   void UnregisterForMergeSession();
 
   // The underlying dialog object.
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
 
   // A count of how many requests received to regenerate preview data.
   // Initialized to 0 then incremented and emitted to a histogram.
@@ skipping 38 matching lines @@
   // Notifies tests that want to know if the PDF has been saved. This doesn't
   // notify the test if it was a successful save, only that it was attempted.
   base::Closure pdf_file_saved_closure_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_