[Print Preview] Modified PP_PrintSettings_Dev interface to support auto fit to page functionality.

chrome/common/print_messages.cc

Index: chrome/common/print_messages.cc
diff --git a/chrome/common/print_messages.cc b/chrome/common/print_messages.cc
index a0656e4c45df9661b5d7a3983f4a12cc61ae9069..f52ddda7d2aa24da7b7930f641126b3ad17631dc 100644
--- a/chrome/common/print_messages.cc
+++ b/chrome/common/print_messages.cc
@@ -24,6 +24,7 @@ PrintMsg_Print_Params::PrintMsg_Print_Params()
     preview_ui_addr(),
     preview_request_id(0),
     is_first_request(false),
+    fit_pdf_page_to_paper_size(true),
     print_to_pdf(false),
     display_header_footer(false),
     date(),
@@ -49,6 +50,7 @@ void PrintMsg_Print_Params::Reset() {
   preview_ui_addr = std::string();
   preview_request_id = 0;
   is_first_request = false;
+  fit_pdf_page_to_paper_size = true;
   print_to_pdf = false;
   display_header_footer = false;
   date = string16();