Added PPB function to return default print settings

ppapi/cpp/dev/printing_dev.h

Index: ppapi/cpp/dev/printing_dev.h
diff --git a/ppapi/cpp/dev/printing_dev.h b/ppapi/cpp/dev/printing_dev.h
index 734015f4d3d72b1fce816c59c000135dfd4ff998..551bbbaf9c3e67a9c5bc9205f5be812135b5c88b 100644
--- a/ppapi/cpp/dev/printing_dev.h
+++ b/ppapi/cpp/dev/printing_dev.h
@@ -30,6 +30,11 @@ class Printing_Dev {
   virtual void PrintEnd() = 0;
   virtual bool IsPrintScalingDisabled() = 0;
 
+  // PPB_Printing_Dev functions.
+  // Outputs the default print settings for the default printer into
+  // |print_settings|. Returns false on error.
+  bool GetDefaultPrintSettings(PP_PrintSettings_Dev* print_settings);
+
  private:
   InstanceHandle associated_instance_;
 };