Print Preview: change getPreview to cr.sendWithPromise

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 <memory>
+#include <queue>
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "chrome/common/features.h"
 #include "components/signin/core/browser/gaia_cookie_manager_service.h"
@@ skipping 50 matching lines @@
   void FileSelectionCanceled(void* params) override;
 
   // GaiaCookieManagerService::Observer implementation.
   void OnAddAccountToCookieCompleted(
       const std::string& account_id,
       const GoogleServiceAuthError& error) override;
 
   // Called when print preview failed.
   void OnPrintPreviewFailed();
 
+  // Called when print preview is cancelled due to a new request.
+  void OnPrintPreviewCancelled();
+
+  // Called when printer settings were invalid.
+  void OnInvalidPrinterSettings();
+
+  // Called when print preview is ready.
+  void OnPrintPreviewReady(int preview_uid, int request_id);
+
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
   // Called when the user press ctrl+shift+p to display the native system
   // dialog.
   void ShowSystemDialog();
 #endif  // BUILDFLAG(ENABLE_BASIC_PRINTING)
 
 #if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
   // PrivetLocalPrinterLister::Delegate implementation.
   void LocalPrinterChanged(
       const std::string& name,
@@ skipping 325 matching lines @@
 #endif
 
   // Handles requests for extension printers. Created lazily by calling
   // |EnsureExtensionPrinterHandlerSet|.
   std::unique_ptr<PrinterHandler> extension_printer_handler_;
 
   // 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_;
 
+  std::queue<std::string> preview_callbacks_;
+
 #if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
   // Callback ID to be used to notify UI that privet search is finished.
   std::string privet_search_callback_id_;
 
   // Callback ID to be used to notify UI that privet printing is finished.
   std::string privet_print_callback_id_;
 #endif
 
   // Callback ID to be used to notify UI that PDF file selection has finished.
   std::string pdf_callback_id_;
 
   // Print settings to use in the local print request to send when
   // HandleHidePreview() is called.
   std::unique_ptr<base::DictionaryValue> settings_;
 
   // Proxy for calls to the print backend.  Lazily initialized since web_ui() is
   // not available at construction time.
   std::unique_ptr<printing::PrinterBackendProxy> printer_backend_proxy_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_