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

chrome/renderer/mock_printer.h

Index: chrome/renderer/mock_printer.h
diff --git a/chrome/renderer/mock_printer.h b/chrome/renderer/mock_printer.h
index 255dbd8e6e46ab46735f3b854f30e4c75aa585a6..d75129e0801a3104894d60145ea4bc11293cb239 100644
--- a/chrome/renderer/mock_printer.h
+++ b/chrome/renderer/mock_printer.h
@@ -143,6 +143,9 @@ class MockPrinter {
   bool print_to_pdf_;
   int preview_request_id_;
 
+  // True if we want to fit the html/pdf source to paper size.
+  bool fit_to_paper_size_;
+
   // Used for displaying headers and footers.
   bool display_header_footer_;
   string16 date_;