[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/provided_file_system.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/provided_file_system.h"
 
 #include "base/files/file.h"
 #include "chrome/browser/chromeos/file_system_provider/operations/get_metadata.h"
+#include "chrome/browser/chromeos/file_system_provider/operations/read_directory.h"
 #include "chrome/browser/chromeos/file_system_provider/operations/unmount.h"
 #include "chrome/browser/chromeos/file_system_provider/request_manager.h"
 #include "chrome/common/extensions/api/file_system_provider.h"
 #include "extensions/browser/event_router.h"
 
 namespace chromeos {
 namespace file_system_provider {
 namespace {
 
 }  // namespace
@@ skipping 20 matching lines @@
     const base::FilePath& entry_path,
     const fileapi::AsyncFileUtil::GetFileInfoCallback& callback) {
   if (!request_manager_.CreateRequest(
           make_scoped_ptr<RequestManager::HandlerInterface>(
               new operations::GetMetadata(
                   event_router_, file_system_info_, entry_path, callback)))) {
     callback.Run(base::File::FILE_ERROR_SECURITY, base::File::Info());
   }
 }
 
+void ProvidedFileSystem::ReadDirectory(
+    const base::FilePath& directory_path,
+    const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback) {
+  if (!request_manager_.CreateRequest(make_scoped_ptr<
+          RequestManager::HandlerInterface>(new operations::ReadDirectory(
+          event_router_, file_system_info_, directory_path, callback)))) {
+    callback.Run(base::File::FILE_ERROR_SECURITY,
+                 fileapi::AsyncFileUtil::EntryList(),
+                 false /* has_more */);
+  }
+}
+
 const ProvidedFileSystemInfo& ProvidedFileSystem::GetFileSystemInfo() const {
   return file_system_info_;
 }
 
 RequestManager* ProvidedFileSystem::GetRequestManager() {
   return &request_manager_;
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos