Print Preview: change getPreview to cr.sendWithPromise

chrome/browser/ui/webui/print_preview/print_preview_ui.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_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 97 matching lines @@
   void OnPreviewDataIsAvailable(int expected_pages_count,
                                 int preview_request_id);
 
   // Notifies the Web UI that the print preview failed to render.
   void OnPrintPreviewFailed();
 
   // Notified the Web UI that this print preview dialog's RenderProcess has been
   // closed, which may occur for several reasons, e.g. tab closure or crash.
   void OnPrintPreviewDialogClosed();
 
+  // Notifies the Web UI that the preview request was cancelled.
+  void OnPrintPreviewCancelled();
+
   // Notifies the Web UI that initiator is closed, so we can disable all the
   // controls that need the initiator for generating the preview data.
   void OnInitiatorClosed();
 
   // Notifies the Web UI that the printer is unavailable or its settings are
   // invalid.
   void OnInvalidPrinterSettings();
 
   // Notifies the Web UI to cancel the pending preview request.
   void OnCancelPendingPreviewRequest();
@@ skipping 53 matching lines @@
   // title.
   base::string16 initiator_title_;
 
   // Keeps track of whether OnClosePrintPreviewDialog() has been called or not.
   bool dialog_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_