Implement Pepper proxy for PPB_DirectoryReader

ppapi/proxy/resource_creation_proxy.cc

Index: ppapi/proxy/resource_creation_proxy.cc
diff --git a/ppapi/proxy/resource_creation_proxy.cc b/ppapi/proxy/resource_creation_proxy.cc
index d8d4f7f9832a8b912167f78c6aae82bd70cccf0f..cb33237875289ad41f065a6311f627d8a827137a 100644
--- a/ppapi/proxy/resource_creation_proxy.cc
+++ b/ppapi/proxy/resource_creation_proxy.cc
@@ -10,6 +10,7 @@
 #include "ppapi/proxy/audio_input_resource.h"
 #include "ppapi/proxy/browser_font_resource_trusted.h"
 #include "ppapi/proxy/connection.h"
+#include "ppapi/proxy/directory_reader_resource.h"
 #include "ppapi/proxy/file_chooser_resource.h"
 #include "ppapi/proxy/file_io_resource.h"
 #include "ppapi/proxy/flash_device_id_resource.h"
@@ -318,8 +319,10 @@ PP_Resource ResourceCreationProxy::CreateBuffer(PP_Instance instance,
 
 PP_Resource ResourceCreationProxy::CreateDirectoryReader(
     PP_Resource directory_ref) {
-  NOTIMPLEMENTED();  // Not proxied yet.
-  return 0;
+  Resource* object =
+      PpapiGlobals::Get()->GetResourceTracker()->GetResource(directory_ref);
+  return (new DirectoryReaderResource(
+      GetConnection(), object->pp_instance(), directory_ref))->GetReference();
 }
 
 PP_Resource ResourceCreationProxy::CreateFlashDeviceID(PP_Instance instance) {