Add ARC contents filesystem type

storage/common/fileapi/file_system_util.cc

Index: storage/common/fileapi/file_system_util.cc
diff --git a/storage/common/fileapi/file_system_util.cc b/storage/common/fileapi/file_system_util.cc
index 0472c957d28c103b03acf40aa68a05e246da6c4b..1116fcd563118eaf1b97315c2cd83d5bd964f8a6 100644
--- a/storage/common/fileapi/file_system_util.cc
+++ b/storage/common/fileapi/file_system_util.cc
@@ -321,6 +321,8 @@ std::string GetFileSystemTypeString(FileSystemType type) {
       return "Provided";
     case kFileSystemTypeDeviceMediaAsFileStorage:
       return "DeviceMediaStorage";
+    case kFileSystemTypeArcContent:
+      return "ArcContent";
     case kFileSystemInternalTypeEnumStart:
     case kFileSystemInternalTypeEnumEnd:
       NOTREACHED();