SyncFS: Introduce SyncFileSystemBackend

webkit/browser/fileapi/isolated_file_system_backend.cc

Index: webkit/browser/fileapi/isolated_file_system_backend.cc
diff --git a/webkit/browser/fileapi/isolated_file_system_backend.cc b/webkit/browser/fileapi/isolated_file_system_backend.cc
index 97c1962db0cb29e6f0d8cd37df7f1eb70d92457f..4a1dadf8c2946ab26fe285e8feb87948e5367511 100644
--- a/webkit/browser/fileapi/isolated_file_system_backend.cc
+++ b/webkit/browser/fileapi/isolated_file_system_backend.cc
@@ -72,7 +72,8 @@ void IsolatedFileSystemBackend::InitializeFileSystem(
 }
 
 FileSystemFileUtil* IsolatedFileSystemBackend::GetFileUtil(
-    FileSystemType type) {
+    FileSystemType type,
+    const FileSystemContext* context) {
   switch (type) {
     case kFileSystemTypeNativeLocal:
       return isolated_file_util_->sync_file_util();
@@ -87,7 +88,8 @@ FileSystemFileUtil* IsolatedFileSystemBackend::GetFileUtil(
 }
 
 AsyncFileUtil* IsolatedFileSystemBackend::GetAsyncFileUtil(
-    FileSystemType type) {
+    FileSystemType type,
+    const FileSystemContext* context) {
   switch (type) {
     case kFileSystemTypeNativeLocal:
       return isolated_file_util_.get();