Implement asynchronous interface/plumbing for GetDefaultPrintSettings.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index 6fca59fb307f8cb779ec34396f5c5323f8311b24..e1c3121b478877bd1e6d4c36e2b335edbb3bcf19 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -2003,11 +2003,12 @@ void PluginInstance::UnlockMouse(PP_Instance instance) {
   delegate()->UnlockMouse(this);
 }
 
-PP_Bool PluginInstance::GetDefaultPrintSettings(
+int32_t PluginInstance::GetDefaultPrintSettings(
     PP_Instance instance,
-    PP_PrintSettings_Dev* print_settings) {
+    PP_PrintSettings_Dev* print_settings,
+    scoped_refptr< ::ppapi::TrackedCallback> callback) {
   // TODO(raymes): Not implemented for in-process.
-  return PP_FALSE;
+  return PP_ERROR_NOTSUPPORTED;
 }
 
 void PluginInstance::SetTextInputType(PP_Instance instance,