[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/provided_file_system.cc

Index: chrome/browser/chromeos/file_system_provider/provided_file_system.cc
diff --git a/chrome/browser/chromeos/file_system_provider/provided_file_system.cc b/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
index 88c5c3098e3b303fdab3ebaf2d6939429205c16c..7b372f448577848c2d0a1b259434164c7f3cf9c4 100644
--- a/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
+++ b/chrome/browser/chromeos/file_system_provider/provided_file_system.cc
@@ -6,6 +6,7 @@
 
 #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"
@@ -46,6 +47,18 @@ void ProvidedFileSystem::GetMetadata(
   }
 }
 
+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_;
 }