[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util_unittest.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 <string>
 #include <vector>
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 273 matching lines @@
   EXPECT_EQ(base::File::FILE_OK, *logger.error());
 }
 
 TEST_F(FileSystemProviderProviderAsyncFileUtilTest, ReadDirectory) {
   EventLogger logger;
 
   async_file_util_->ReadDirectory(
       CreateOperationContext(),
       root_url_,
       base::Bind(&EventLogger::OnReadDirectory, logger.GetWeakPtr()));
+  base::RunLoop().RunUntilIdle();
 
   ASSERT_TRUE(logger.error());
-  EXPECT_EQ(base::File::FILE_ERROR_NOT_FOUND, *logger.error());
+  EXPECT_EQ(base::File::FILE_OK, *logger.error());
 }
 
 TEST_F(FileSystemProviderProviderAsyncFileUtilTest, Touch) {
   EventLogger logger;
 
   async_file_util_->CreateDirectory(
       CreateOperationContext(),
       file_url_,
       false,  // exclusive
       false,  // recursive
@@ skipping 101 matching lines @@
       CreateOperationContext(),
       file_url_,
       base::Bind(&EventLogger::OnCreateSnapshotFile, logger.GetWeakPtr()));
 
   ASSERT_TRUE(logger.error());
   EXPECT_EQ(base::File::FILE_ERROR_NOT_FOUND, *logger.error());
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos