[Chrome] Support NumCopies print preset

ppapi/cpp/dev/printing_dev.cc

Index: ppapi/cpp/dev/printing_dev.cc
diff --git a/ppapi/cpp/dev/printing_dev.cc b/ppapi/cpp/dev/printing_dev.cc
index 60154cd0d37f85f58d5e3115322cd56b67c6760d..4d53c2afee9582da900d9831ffafa5f7f6d67386 100644
--- a/ppapi/cpp/dev/printing_dev.cc
+++ b/ppapi/cpp/dev/printing_dev.cc
@@ -65,13 +65,17 @@ PP_Bool IsScalingDisabled(PP_Instance instance) {
   return PP_FromBool(return_value);
 }
 
+int32_t GetCopiesToPrint(PP_Instance instance) {
+  void* object =
+      pp::Instance::GetPerInstanceObject(instance, kPPPPrintingInterface);
+  if (!object)
+    return 1;
+  return static_cast<Printing_Dev*>(object)->GetCopiesToPrint();
+}
+
 const PPP_Printing_Dev ppp_printing = {
-  &QuerySupportedFormats,
-  &Begin,
-  &PrintPages,
-  &End,
-  &IsScalingDisabled
-};
+    &QuerySupportedFormats, &Begin,             &PrintPages,
+    &End,                   &IsScalingDisabled, &GetCopiesToPrint};
 
 }  // namespace