Extract external file systems handling from isolated context.

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 064a4f97e644eb1add766225794f92f3933aa0b3..17aa35cc7977d610850036c0f337bc537ead9042 100644
--- a/webkit/fileapi/file_system_types.h
+++ b/webkit/fileapi/file_system_types.h
@@ -57,6 +57,10 @@ enum FileSystemType {
   // Restricted native local file system is in read-only mode.
   kFileSystemTypeRestrictedNativeLocal,
 
+  // Indicates a isolated local filesystem where we can access files using
+  // native local path.
+  kFileSystemTypeIsolatedNativeLocal,

[kinuko, 2013/01/09 16:37:12]

Why do we need this separate type?

[tonibarzic, 2013/01/09 17:09:46]

I don't think we need.. I wanted to check something and forgot to undo this
change  before upload

+
   // Indicates a transient, isolated file system for dragged files (which could
   // contain multiple dragged paths in the virtual root).
   kFileSystemTypeDragged,