Oilpan: add transition types to FileSystem APIs.

Source/modules/filesystem/EntrySync.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     Custom=Wrap,
     NoInterfaceObject,
+    WillBeGarbageCollected,
 ] interface EntrySync {
     readonly attribute boolean isFile;
     readonly attribute boolean isDirectory;
     readonly attribute DOMString name;
     readonly attribute DOMString fullPath;
     readonly attribute DOMFileSystemSync filesystem;
 
     [RaisesException] Metadata getMetadata();
     [RaisesException] EntrySync moveTo(DirectoryEntrySync parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString name);
     [RaisesException] EntrySync copyTo(DirectoryEntrySync parent, [TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString name);
     DOMString toURL();
     [RaisesException] void remove();
     DirectoryEntrySync getParent();
 };