Fix print preview workflow to reflect settings of selected printer.

chrome/renderer/mock_printer.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/renderer/mock_printer.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 105 matching lines @@
   settings->params.display_header_footer = display_header_footer_;
   settings->params.date = date_;
   settings->params.title = title_;
   settings->params.url = url_;
   printer_status_ = PRINTER_PRINTING;
 }
 
 void MockPrinter::UpdateSettings(int cookie,
                                  PrintMsg_PrintPages_Params* params,
                                  const std::vector<int>& pages) {
-  EXPECT_EQ(document_cookie_, cookie);
-
+  if (document_cookie_ == -1) {
+    document_cookie_ = CreateDocumentCookie();
+  }
   params->Reset();
   params->pages = pages;
   SetPrintParams(&(params->params));
   printer_status_ = PRINTER_PRINTING;
 }
 
 void MockPrinter::SetPrintedPagesCount(int cookie, int number_pages) {
   // Verify the input parameter and update the printer status so that the
   // RenderViewTest class can verify the this function finishes without errors.
   EXPECT_EQ(document_cookie_, cookie);
@@ skipping 121 matching lines @@
   params->printable_size = printable_size_;
   params->margin_left = margin_left_;
   params->margin_top = margin_top_;
   params->is_first_request = is_first_request_;
   params->preview_request_id = preview_request_id_;
   params->display_header_footer = display_header_footer_;
   params->date = date_;
   params->title = title_;
   params->url = url_;
 }