Print Preview: Notify the print preview of the page count when reusing existing preview data.

chrome/browser/printing/print_preview_message_handler.cc

 // 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.
 
 #include "chrome/browser/printing/print_preview_message_handler.h"
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 95 matching lines @@
   if (!print_preview_tab)
     return;
 
   PrintPreviewUI* print_preview_ui =
       static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
 
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(print_preview_tab);
 
   if (params.reuse_existing_data) {
+    // Need to match normal rendering where we are expected to send this.
+    print_preview_ui->OnDidGetPreviewPageCount(params.expected_pages_count);
+
     print_preview_ui->OnPreviewDataIsAvailable(
         params.expected_pages_count,
         wrapper->print_view_manager()->RenderSourceName(),
         params.modifiable);
     return;
   }
 
   base::SharedMemory* shared_buf =
       new base::SharedMemory(params.metafile_data_handle, true);
   if (!shared_buf->Map(params.data_size)) {
@@ skipping 79 matching lines @@
 }
 
 void PrintPreviewMessageHandler::DidStartLoading() {
   if (tab_contents()->delegate() &&
       printing::PrintPreviewTabController::IsPrintPreviewTab(tab_contents())) {
     tab_contents()->SetContentRestrictions(CONTENT_RESTRICTION_PRINT);
   }
 }
 
 }  // namespace printing