Added PPB function to return default print settings

ppapi/thunk/ppb_instance_api.h

Index: ppapi/thunk/ppb_instance_api.h
diff --git a/ppapi/thunk/ppb_instance_api.h b/ppapi/thunk/ppb_instance_api.h
index c8cc23037eb1110e8b733be3b75f7b098246ffdc..97fd0b68877a98c39e4596b9e65e0c5faf4129b0 100644
--- a/ppapi/thunk/ppb_instance_api.h
+++ b/ppapi/thunk/ppb_instance_api.h
@@ -5,6 +5,7 @@
 #ifndef PPAPI_THUNK_INSTANCE_API_H_
 #define PPAPI_THUNK_INSTANCE_API_H_
 
+#include "ppapi/c/dev/pp_print_settings_dev.h"
 #include "ppapi/c/dev/ppb_console_dev.h"
 #include "ppapi/c/dev/ppb_text_input_dev.h"
 #include "ppapi/c/dev/ppb_url_util_dev.h"
@@ -111,6 +112,11 @@ class PPB_Instance_API {
                             PP_CompletionCallback callback) = 0;
   virtual void UnlockMouse(PP_Instance instance) = 0;
 
+  // Printing.
+  virtual PP_Bool GetDefaultPrintSettings(
+      PP_Instance instance,
+      PP_PrintSettings_Dev* print_settings) = 0;
+
   // TextInput.
   virtual void SetTextInputType(PP_Instance instance,
                                 PP_TextInput_Type type) = 0;