Added PPB function to return default print settings

ppapi/thunk/ppb_printing_thunk.cc

Index: ppapi/thunk/ppb_printing_thunk.cc
diff --git a/ppapi/thunk/ppb_printing_thunk.cc b/ppapi/thunk/ppb_printing_thunk.cc
new file mode 100644
index 0000000000000000000000000000000000000000..66021895a7a8ebdb4efc75f1c39b1f9bb34f4c37
--- /dev/null
+++ b/ppapi/thunk/ppb_printing_thunk.cc
@@ -0,0 +1,33 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/c/dev/ppb_printing_dev.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/thunk.h"
+
+namespace ppapi {
+namespace thunk {
+
+namespace {
+
+PP_Bool GetDefaultPrintSettings(PP_Instance instance,
+                                PP_PrintSettings_Dev* print_settings) {
+  EnterInstance enter(instance);
+  if (enter.failed())
+    return PP_FALSE;
+  return enter.functions()->GetDefaultPrintSettings(instance, print_settings);
+}
+
+const PPB_Printing_Dev g_ppb_printing_dev_thunk = {
+  &GetDefaultPrintSettings,
+};
+
+}  // namespace
+
+const PPB_Printing_Dev_0_6* GetPPB_Printing_Dev_0_6_Thunk() {
+  return &g_ppb_printing_dev_thunk;
+}
+
+}  // namespace thunk
+}  // namespace ppapi