Added Header and Footer support using Skia

printing/printing_context.h

Index: printing/printing_context.h
diff --git a/printing/printing_context.h b/printing/printing_context.h
index dd7e058b373444b16ad55f749b7e1885bb5e5b3a..8b4ffd5bd923ec84e65003ab717e7d4fded7c6c1 100644
--- a/printing/printing_context.h
+++ b/printing/printing_context.h
@@ -109,6 +109,11 @@ class PrintingContext {
   // Does bookkeeping when an error occurs.
   PrintingContext::Result OnError();
 
+  // Extracts the header and footer strings into |header_footer_info| if
+  // headers and footers are to be printed.
+  void GetHeaderFooterInfo(const base::DictionaryValue& settings,
+                           base::DictionaryValue* header_footer_info);
+
   // Complete print context settings.
   PrintSettings settings_;