Add ARC contents filesystem type

storage/common/fileapi/file_system_types.h

Index: storage/common/fileapi/file_system_types.h
diff --git a/storage/common/fileapi/file_system_types.h b/storage/common/fileapi/file_system_types.h
index 3f4f942cd9ec94e58e4724725779ec5bfcd7b732..6ac262cc4ff1b3175f58a698eac11c7e87c3f602 100644
--- a/storage/common/fileapi/file_system_types.h
+++ b/storage/common/fileapi/file_system_types.h
@@ -123,6 +123,9 @@ enum FileSystemType {
   // limited to media files.
   kFileSystemTypeDeviceMediaAsFileStorage,
 
+  // A filesystem to provide access to contents managed by ARC.
+  kFileSystemTypeArcContent,
+
   // --------------------------------------------------------------------
   // Marks the end of internal type enum. (This is not the actual fs type)
   // New internal filesystem types must be added above this line.