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..3f15f1703757dca5273780336c303aaceb437b58 100644
--- a/ppapi/cpp/dev/printing_dev.h
+++ b/ppapi/cpp/dev/printing_dev.h
@@ -30,6 +30,12 @@ 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(const InstanceHandle& instance,
+                               PP_PrintSettings_Dev* print_settings);
+
  private:
   InstanceHandle associated_instance_;
 };