[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 6a3a5181974977defb78713bc667e9171dd491f1..7078091b8515fd35548c626e02cc2ce4a74a0624 100644
--- a/pdf/out_of_process_instance.cc
+++ b/pdf/out_of_process_instance.cc
@@ -976,6 +976,14 @@ void OutOfProcessInstance::OnPrint(int32_t) {
   pp::PDF::Print(this);
 }
 
+void OutOfProcessInstance::SetPrintPresetOptionsFromDocument() {
+  PP_PrintPresetOptions_Dev print_options;
+  print_options.is_scaling_disabled = PP_FromBool(IsPrintScalingDisabled());
+  print_options.copies = engine_->GetCopiesToPrint();
+
+  pp::Printing_Dev::SetPrintPresetOptionsFromDocument(print_options);
+}
+
 void OutOfProcessInstance::SubmitForm(const std::string& url,
                                       const void* data,
                                       int length) {
@@ -1069,6 +1077,8 @@ void OutOfProcessInstance::DocumentLoadComplete(int page_count) {
   if (IsPrintPreview()) {
     AppendBlankPrintPreviewPages();
     OnGeometryChanged(0, 0);
+    // Set print preset options from pdf document.
+    SetPrintPresetOptionsFromDocument();
   }
 
   pp::VarDictionary message;