SyncFS: Introduce SyncFileSystemBackend

chrome/browser/chromeos/fileapi/file_system_backend.cc

Index: chrome/browser/chromeos/fileapi/file_system_backend.cc
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.cc b/chrome/browser/chromeos/fileapi/file_system_backend.cc
index 1cc745799142c7ca6a306efb0cbe35444013d644..02faa60f19d8da91c6481b5a02993c90efc993a1 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.cc
@@ -208,14 +208,16 @@ std::vector<base::FilePath> FileSystemBackend::GetRootDirectories() const {
 }
 
 fileapi::FileSystemFileUtil* FileSystemBackend::GetFileUtil(
-    fileapi::FileSystemType type) {
+    fileapi::FileSystemType type,
+    const fileapi::FileSystemContext* context) {
   DCHECK(type == fileapi::kFileSystemTypeNativeLocal ||
          type == fileapi::kFileSystemTypeRestrictedNativeLocal);
   return local_file_util_->sync_file_util();
 }
 
 fileapi::AsyncFileUtil* FileSystemBackend::GetAsyncFileUtil(
-    fileapi::FileSystemType type) {
+    fileapi::FileSystemType type,
+    const fileapi::FileSystemContext* context) {
   if (type == fileapi::kFileSystemTypeDrive)
     return drive_delegate_->GetAsyncFileUtil(type);