[Print Preview] Refactored code to support auto fit to page functionality.

chrome/renderer/mock_printer.cc

Index: chrome/renderer/mock_printer.cc
diff --git a/chrome/renderer/mock_printer.cc b/chrome/renderer/mock_printer.cc
index 949e588d74b3117daf9f1284859d0e958555474c..5848ce80186e6a7858360ab064bed1b456011642 100644
--- a/chrome/renderer/mock_printer.cc
+++ b/chrome/renderer/mock_printer.cc
@@ -65,6 +65,7 @@ MockPrinter::MockPrinter()
     is_first_request_(true),
     print_to_pdf_(false),
     preview_request_id_(0),
+    fit_to_paper_size_(true),
     display_header_footer_(false),
     date_(ASCIIToUTF16("date")),
     title_(ASCIIToUTF16("title")),
@@ -150,6 +151,7 @@ void MockPrinter::ScriptedPrint(int cookie,
   settings->params.content_size = content_size_;
   settings->params.printable_area = printable_area_;
   settings->params.is_first_request = is_first_request_;
+  settings->params.fit_to_paper_size = fit_to_paper_size_;
   settings->params.print_to_pdf = print_to_pdf_;
   settings->params.preview_request_id = preview_request_id_;
   settings->params.display_header_footer = display_header_footer_;
@@ -303,6 +305,7 @@ void MockPrinter::SetPrintParams(PrintMsg_Print_Params* params) {
   params->margin_left = margin_left_;
   params->margin_top = margin_top_;
   params->is_first_request = is_first_request_;
+  params->fit_to_paper_size = fit_to_paper_size_;
   params->print_to_pdf = print_to_pdf_;
   params->preview_request_id = preview_request_id_;
   params->display_header_footer = display_header_footer_;