Added PPB function to return default print settings

ppapi/cpp/dev/printing_dev.cc

 // Copyright (c) 2011 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/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"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 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);
   if (!object)
     return 0;
   return static_cast<Printing_Dev*>(object)->QuerySupportedPrintOutputFormats();
 }
 
 int32_t Begin(PP_Instance instance,
               const struct PP_PrintSettings_Dev* print_settings) {
@@ skipping 46 matching lines @@
       : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPPrintingInterface, &ppp_printing);
   instance->AddPerInstanceObject(kPPPPrintingInterface, this);
 }
 
 Printing_Dev::~Printing_Dev() {
   Instance::RemovePerInstanceObject(associated_instance_,
                                     kPPPPrintingInterface, this);
 }
 
+bool Printing_Dev::GetDefaultPrintSettings(
+    const InstanceHandle& instance_handle,

[yzshen1, 2012/06/14 05:01:38]

Can we use associated_instance_? 

[raymes, 2012/06/14 17:30:49]

Done.

+    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(
+          instance_handle.pp_instance(), print_settings));
+}
+
 }  // namespace pp