[Chrome] Support NumCopies print preset

pdf/out_of_process_instance.cc

Index: pdf/out_of_process_instance.cc
diff --git a/pdf/out_of_process_instance.cc b/pdf/out_of_process_instance.cc
index a08f8b053fd1cbe74273285136fb4bb59ea7c266..e1f471ae8b262489881b23f7e6e923499bcb2da0 100644
--- a/pdf/out_of_process_instance.cc
+++ b/pdf/out_of_process_instance.cc
@@ -602,6 +602,10 @@ bool OutOfProcessInstance::IsPrintScalingDisabled() {
   return !engine_->GetPrintScaling();
 }
 
+int32_t OutOfProcessInstance::GetNumCopies() {
+  return engine_->GetNumCopies();
+}
+
 bool OutOfProcessInstance::StartFind(const std::string& text,
                                                  bool case_sensitive) {
   engine_->StartFind(text.c_str(), case_sensitive);