[Print Preview]: Added code to support pdf fit to page functionality.

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index 55a2e6be638d188e5fc8b1415c7fc76f5332be3a..bb9cfd5f115092e4901437bca058527dbb0eb4ba 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -160,6 +160,20 @@ class PrintWebViewHelper
   // Returns true if the current destination printer is PRINT_TO_PDF.
   bool IsPrintToPdfRequested(const base::DictionaryValue& settings);
 
+  // Returns false if
+  // (1) The current destination printer is SAVE_AS_PDF or
+  // (2) User is printing the preview data or
+  // (3) Source is PDF. This is the first preview request and print scaling
+  // option is disabled for initiator renderer plugin.
+  // In all other cases returns true to fit the print contents in paper size.
+  bool IsFitToPaperSizeRequested(const base::DictionaryValue& job_settings,
+                                 const PrintMsg_Print_Params& params);
+
+  // Returns true if the preview source is HTML, false otherwise.
+  bool IsSourceHTML(const WebKit::WebFrame* frame,
+                    const WebKit::WebNode& node,
+                    const base::DictionaryValue& job_settings);
+
   // Initiate print preview.
   void OnInitiatePrintPreview();