kFileSystemTypeIsolated should be only used in the URL exposed to renderer

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 936c81f4e2fe58fecbf460c00034bb4deedd8681..d376b37037990b18d486c0528fe1865409ecbc25 100644
--- a/webkit/fileapi/file_system_types.h
+++ b/webkit/fileapi/file_system_types.h
@@ -13,6 +13,10 @@ enum FileSystemType {
   // Indicates uninitialized or invalid filesystem type.
   kFileSystemTypeUnknown = -1,
 
+  // ------------------------------------------------------------------------
+  // Public FileSystem types, that are embedded in filesystem: URL and exposed
+  // to WebKit/renderer. Both Chrome and WebKit knows how to handle these types.
+
   // Following two types are for TEMPORARY or PERSISTENT filesystems that
   // can be used by webapps via standard app-facing API
   // as defined in File API: Directories and System.
@@ -31,15 +35,21 @@ enum FileSystemType {
   // This filesystem is used only by Chrome OS as of writing.
   kFileSystemTypeExternal = WebKit::WebFileSystem::TypeExternal,
 
+  // ------------------------------------------------------------------------
+  // Private FileSystem types, that should not appear in filesystem: URL as
+  // WebKit has no idea how to handle those types.
+  //
+  // One can register (mount) a new file system with a private file system type
+  // using IsolatedContext.  Files in such file systems can be accessed via
+  // either Isolated or External public file system types (depending on
+  // how the file system is registered).
+  // See the comment at IsolatedContext and/or FileSystemURL for more details.
+
   // Should be used only for testing.
   kFileSystemTypeTest = 100,
 
-  // Following file system types are internal and they are not exposed to
-  // WebKit, but are accessible via IsolatedContext.
-
-  // Indicates a transient, isolated file system for a native local path.
-  // TODO(kinuko): Rename all kFileSystemTypeIsolated used as internal type
-  // with this one.
+  // Indicates a local filesystem where we can access files using native
+  // local path.
   kFileSystemTypeNativeLocal,
 
   // Indicates a transient, isolated file system for dragged files (which could