Launch packaged app with files on Drive on Chrome OS.

webkit/fileapi/file_system_types.h

Index: webkit/fileapi/file_system_types.h
diff --git a/webkit/fileapi/file_system_types.h b/webkit/fileapi/file_system_types.h
index ca09ee6e02c3b112ffa826747973c5c6d6b40761..11b5fa3f5a63e42e6598d2fc4a7099f72661bd05 100644
--- a/webkit/fileapi/file_system_types.h
+++ b/webkit/fileapi/file_system_types.h
@@ -76,6 +76,12 @@ enum FileSystemType {
   // Indicates a Syncable sandboxed filesystem which can be backed by a
   // cloud storage service.
   kFileSystemTypeSyncable,
+
+  // Indicates an external filesystem accessible by file paths from platform
+  // Apps. As of writing, on non Chrome OS platform, this is merely a
+  // kFileSystemTypeNativeLocal. On Chrome OS, the path is parsed by
+  // the handlers of kFileSystemTypeExternal.
+  kFileSystemTypeNativeForPlatformApp,
 };
 
 }  // namespace fileapi