Print Preview: change getPreview to cr.sendWithPromise

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 601 matching lines @@
   if (!initial_preview_start_time_.is_null()) {
     UMA_HISTOGRAM_TIMES("PrintPreview.InitialDisplayTime",
                         base::TimeTicks::Now() - initial_preview_start_time_);
     UMA_HISTOGRAM_COUNTS("PrintPreview.PageCount.Initial",
                          expected_pages_count);
     UMA_HISTOGRAM_COUNTS(
         "PrintPreview.RegeneratePreviewRequest.BeforeFirstData",
         handler_->regenerate_preview_request_count());
     initial_preview_start_time_ = base::TimeTicks();
   }
-  base::Value ui_identifier(id_);
-  base::Value ui_preview_request_id(preview_request_id);
-  web_ui()->CallJavascriptFunctionUnsafe("updatePrintPreview", ui_identifier,
-                                         ui_preview_request_id);
+  handler_->OnPrintPreviewReady(id_, preview_request_id);
 }
 
 void PrintPreviewUI::OnCancelPendingPreviewRequest() {
   g_print_preview_request_id_map.Get().Set(id_, -1);
 }
 
-void PrintPreviewUI::OnPrintPreviewFailed() {
-  handler_->OnPrintPreviewFailed();
-  web_ui()->CallJavascriptFunctionUnsafe("printPreviewFailed");
+void PrintPreviewUI::OnPrintPreviewFailed(int request_id) {
+  handler_->OnPrintPreviewFailed(request_id);
 }
 
-void PrintPreviewUI::OnInvalidPrinterSettings() {
-  web_ui()->CallJavascriptFunctionUnsafe("invalidPrinterSettings");
+void PrintPreviewUI::OnInvalidPrinterSettings(int request_id) {
+  handler_->OnInvalidPrinterSettings(request_id);
 }
 
 void PrintPreviewUI::OnHidePreviewDialog() {
   WebContents* preview_dialog = web_ui()->GetWebContents();
   printing::BackgroundPrintingManager* background_printing_manager =
       g_browser_process->background_printing_manager();
   if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
     return;
 
   ConstrainedWebDialogDelegate* delegate = GetConstrainedDelegate();
@@ skipping 39 matching lines @@
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }