Added PPB function to return default print settings

ppapi/cpp/dev/printing_dev.cc

Index: ppapi/cpp/dev/printing_dev.cc
diff --git a/ppapi/cpp/dev/printing_dev.cc b/ppapi/cpp/dev/printing_dev.cc
index 72affff56a1f27872d40e7033793799fc8290b3e..449a4bc640865a1e8bac1c803fb9dd52aea9a73b 100644
--- a/ppapi/cpp/dev/printing_dev.cc
+++ b/ppapi/cpp/dev/printing_dev.cc
@@ -4,6 +4,7 @@
 
 #include "ppapi/cpp/dev/printing_dev.h"
 
+#include "ppapi/c/dev/ppb_printing_dev.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
@@ -15,6 +16,10 @@ namespace {
 
 static const char kPPPPrintingInterface[] = PPP_PRINTING_DEV_INTERFACE;
 
+template <> const char* interface_name<PPB_Printing_Dev_0_6>() {
+  return PPB_PRINTING_DEV_INTERFACE_0_6;
+}
+
 uint32_t QuerySupportedFormats(PP_Instance instance) {
   void* object =
       Instance::GetPerInstanceObject(instance, kPPPPrintingInterface);
@@ -81,4 +86,13 @@ Printing_Dev::~Printing_Dev() {
                                     kPPPPrintingInterface, this);
 }
 
+bool Printing_Dev::GetDefaultPrintSettings(
+    PP_PrintSettings_Dev* print_settings) {
+  if (!has_interface<PPB_Printing_Dev_0_6>())
+    return PP_FALSE;
+  return PP_ToBool(
+      get_interface<PPB_Printing_Dev_0_6>()->GetDefaultPrintSettings(
+          associated_instance_.pp_instance(), print_settings));
+}
+
 }  // namespace pp