Add a printing resource (as a new style resource) to fetch the default print settings

ppapi/thunk/ppb_printing_api.h

Index: ppapi/thunk/ppb_printing_api.h
diff --git a/ppapi/thunk/ppb_printing_api.h b/ppapi/thunk/ppb_printing_api.h
new file mode 100644
index 0000000000000000000000000000000000000000..ac604ef0bd2ae52ce2b3fa633bc8b4c7b6651f6f
--- /dev/null
+++ b/ppapi/thunk/ppb_printing_api.h
@@ -0,0 +1,29 @@
+// 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.
+
+#ifndef PPAPI_THUNK_PPB_PRINTING_API_H_
+#define PPAPI_THUNK_PPB_PRINTING_API_H_
+
+#include "base/memory/ref_counted.h"
+#include "ppapi/c/dev/ppb_printing_dev.h"
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace thunk {
+
+class PPB_Printing_API {
+ public:
+  virtual ~PPB_Printing_API() {}
+
+  virtual int32_t GetDefaultPrintSettings(
+      PP_PrintSettings_Dev *print_settings,
+      scoped_refptr<TrackedCallback> callback) = 0;
+};
+
+}  // namespace thunk
+}  // namespace ppapi
+
+#endif  // PPAPI_THUNK_PPB_PRINTING_API_H_