[Chrome] Support NumCopies print preset

ppapi/cpp/dev/printing_dev.cc

 // 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/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"
@@ skipping 47 matching lines @@
 PP_Bool IsScalingDisabled(PP_Instance instance) {
   void* object =
       pp::Instance::GetPerInstanceObject(instance, kPPPPrintingInterface);
   if (!object)
     return PP_FALSE;
   bool return_value =
       static_cast<Printing_Dev*>(object)->IsPrintScalingDisabled();
   return PP_FromBool(return_value);
 }
 
-const PPP_Printing_Dev ppp_printing = {
-  &QuerySupportedFormats,
-  &Begin,
-  &PrintPages,
-  &End,
-  &IsScalingDisabled
-};
+int32_t NumCopies(PP_Instance instance) {
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPPrintingInterface);
+  if (!object)
+    return 1;
+  return static_cast<Printing_Dev*>(object)->GetNumCopies();
+}
+
+const PPP_Printing_Dev ppp_printing = {&QuerySupportedFormats, &Begin,
+                                       &PrintPages,            &End,
+                                       &IsScalingDisabled,     &NumCopies};
 
 }  // namespace
 
 Printing_Dev::Printing_Dev(Instance* instance)
     : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPPrintingInterface, &ppp_printing);
   instance->AddPerInstanceObject(
       kPPPPrintingInterface, this);
   if (has_interface<PPB_Printing_Dev_0_7>()) {
     PassRefFromConstructor(get_interface<PPB_Printing_Dev_0_7>()->Create(
@@ skipping 14 matching lines @@
 int32_t Printing_Dev::GetDefaultPrintSettings(
     const CompletionCallbackWithOutput<PP_PrintSettings_Dev>& callback) const {
   if (has_interface<PPB_Printing_Dev_0_7>()) {
     return get_interface<PPB_Printing_Dev_0_7>()->GetDefaultPrintSettings(
         pp_resource(), callback.output(), callback.pp_completion_callback());
   }
   return callback.MayForce(PP_ERROR_NOINTERFACE);
 }
 
 }  // namespace pp