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..74254a12432f92786e051863fac61c9e28afb9e3 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -366,6 +366,14 @@ class PrintingAdapter : public pp::Printing_Dev {
       ppp_printing_->End(plugin_->pp_instance());
   }
 
+  bool IsPrintScalingDisabled() {
+    if (ppp_printing_ != NULL) {
+      PP_Bool result = ppp_printing_->IsScalingDisabled(plugin_->pp_instance());
+      return result == PP_TRUE;
+    }
+    return false;
+  }
+
  private:
   Plugin* plugin_;
   const PPP_Printing_Dev* ppp_printing_;