Add IsScalingDisabled and PP_PRINTOUTPUTFORMAT_EMF to pepper printing interface.

ppapi/native_client/src/trusted/plugin/plugin.cc

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.cc b/ppapi/native_client/src/trusted/plugin/plugin.cc
index 649b94a093811278b54bda92b25849bbbf65703c..0cb4c6c7594bc2dfbeab85941164d0a9b22a9978 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -343,6 +343,13 @@ class PrintingAdapter : public pp::Printing_Dev {
     return 0;
   }
 
+  bool IsPrintScalingDisabled() {
+    if (ppp_printing_ != NULL) {
+      return ppp_printing_->IsScalingDisabled(plugin_->pp_instance());
+    }
+    return false;
+  }
+
   int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) {
     if (ppp_printing_ != NULL) {
       return ppp_printing_->Begin(plugin_->pp_instance(), &print_settings);