Add a flag to show if the FileChooserCompletion needs local paths or not.

public/web/WebFileChooserParams.h

 /*
  * Copyright (C) 2010, 2011 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 53 matching lines @@
     //  - replacing with other files
     // before opening a file chooser dialog.
     WebVector<WebString> selectedFiles;
     // See http://www.w3.org/TR/html-media-capture/ for the semantics of the
     // capture attribute. If |useMediaCapture| is true, the media types
     // indicated in |acceptTypes| should be obtained from the device's
     // environment using a media capture mechanism. |capture| is deprecated and
     // provided for compatibility reasons.
     WebString capture;
     bool useMediaCapture;
+    // Whether WebFileChooserCompletion needs local paths or not. If the result
+    // of file chooser is handled by the implementation of
+    // WebFileChooserCompletion that can handle files without local paths,
+    // 'false' should be specified to the flag.
+    bool needLocalPath;
 
     WebFileChooserParams()
         : multiSelect(false)
         , directory(false)
         , saveAs(false)
         , useMediaCapture(false)
+        , needLocalPath(true)
     {
     }
 };
 
 } // namespace blink
 
 #endif