SyncFS: Introduce SyncFileSystemBackend

chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc

Index: chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc
diff --git a/chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc b/chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc
index 8c799d82f44c723af6a8432e3b77795362dd1cf2..5b4eccfbfd01d1570e2fce6b1355679a52f9660e 100644
--- a/chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc
+++ b/chrome/browser/chromeos/fileapi/cros_mount_point_provider.cc
@@ -106,6 +106,12 @@ bool CrosMountPointProvider::CanHandleType(fileapi::FileSystemType type) const {
   }
 }
 
+GURL CrosMountPointProvider::GetRootURI(const GURL& origin_url,
+                                        fileapi::FileSystemType type) const {
+  NOTIMPLEMENTED();
+  return GURL();
+}
+
 void CrosMountPointProvider::OpenFileSystem(
     const GURL& origin_url,
     fileapi::FileSystemType type,
@@ -121,6 +127,13 @@ fileapi::FileSystemQuotaUtil* CrosMountPointProvider::GetQuotaUtil() {
   return NULL;
 }
 
+const fileapi::UpdateObserverList*
+CrosMountPointProvider::GetUpdateObservers(
+    fileapi::FileSystemType type) const {
+  // No update observer support.
+  return NULL;
+}
+
 bool CrosMountPointProvider::IsAccessAllowed(
     const fileapi::FileSystemURL& url) const {
   if (!url.is_valid())