[Chrome] Support NumCopies print preset

pdf/instance.cc

Index: pdf/instance.cc
diff --git a/pdf/instance.cc b/pdf/instance.cc
index d700be8757d679f00d98f86329a649308e64bfef..e0cd93695c114bf48dee9b7b7569a78c4f422e31 100644
--- a/pdf/instance.cc
+++ b/pdf/instance.cc
@@ -1390,6 +1390,14 @@ void Instance::SaveAs() {
   pp::PDF::SaveAs(this);
 }
 
+void Instance::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 Instance::SubmitForm(const std::string& url,
                           const void* data,
                           int length) {
@@ -1518,6 +1526,9 @@ void Instance::DocumentLoadComplete(int page_count) {
     int initial_page = GetInitialPage(url_);
     if (initial_page >= 0)
       ScrollToPage(initial_page);
+  } else {
+    // Set print preset options from pdf document.
+    SetPrintPresetOptionsFromDocument();
   }
 
   if (!full_)