Do not call stat() when reading directories via File API.

chrome/browser/chromeos/file_system_provider/operations/get_metadata.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/file_system_provider/operations/get_metadata.h"
 
 #include <algorithm>
 #include <string>
 
 #include "chrome/common/extensions/api/file_system_provider.h"
@@ skipping 14 matching lines @@
 
   const Params* params = value->get_metadata_success_params();
   if (!params)
     return false;
 
   if (!ValidateIDLEntryMetadata(params->metadata, root_entry))
     return false;
 
   output->name = params->metadata.name;
   output->is_directory = params->metadata.is_directory;
-  output->size = static_cast<int64>(params->metadata.size);
+  output->size = static_cast<int64>(*params->metadata.size);
 
   std::string input_modification_time;
-  if (!params->metadata.modification_time.additional_properties.GetString(
+  if (!params->metadata.modification_time->additional_properties.GetString(
           "value", &input_modification_time)) {
     NOTREACHED();
   }
 
   // Allow to pass invalid modification time, since there is no way to verify
   // it easily on any earlier stage.
   base::Time::FromString(input_modification_time.c_str(),
                          &output->modification_time);
 
   if (params->metadata.mime_type.get())
     output->mime_type = *params->metadata.mime_type.get();
 
   if (params->metadata.thumbnail.get())
     output->thumbnail = *params->metadata.thumbnail.get();
 
   return true;
 }
 
 }  // namespace
 
 bool ValidateIDLEntryMetadata(
     const extensions::api::file_system_provider::EntryMetadata& metadata,
     bool root_entry) {
   using extensions::api::file_system_provider::EntryMetadata;
 
   if (!ValidateName(metadata.name, root_entry))
     return false;
 
   std::string input_modification_time;
-  if (!metadata.modification_time.additional_properties.GetString(
+  if (metadata.modification_time.get() &&
+      !metadata.modification_time->additional_properties.GetString(
           "value", &input_modification_time)) {
     return false;
   }
 
   if (metadata.thumbnail.get()) {
     // Sanity check for the thumbnail format. Note, that another, more granural
     // check is done in custom bindings. Note, this is an extra check only for
     // the security reasons.
     const std::string expected_prefix = "data:";
     std::string thumbnail_prefix =
@@ skipping 68 matching lines @@
 }
 
 void GetMetadata::OnError(int /* request_id */,
                           scoped_ptr<RequestValue> /* result */,
                           base::File::Error error) {
   callback_.Run(make_scoped_ptr<EntryMetadata>(NULL), error);
 }
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos